chore: keep two blank lines before _is_link

e38764627 left three blank lines after the record function, and
test_install_tui's two-blank-lines check failed Validation. The pins of
install.sh and install.ps1 and the launcher index follow the new hash.

install.ps1

@@ -16,7 +16,7 @@
     # and Invoke-WebRequest throws on a cut transfer before the hash is read:
     # the site's build rewrites this line there (scripts/sitebootstrap.py).
     $mismatchAdvice = "The download was most likely cut short: try again. Within minutes of an update of this project the two files can come from caches of different ages. Waiting five minutes settles that."
-    $defaultInstallSha256 = "000880ee7a1293a5a3bc868b6bf7f3a4f262b61c485564cc11b433908acca817"
+    $defaultInstallSha256 = "26fef8daf6087201d43e1c1cb5b69e255358f38f28ca1e45782984a0240dc7d3"
     # The pin above refuses any changed byte: this cap only stops a body that
     # cannot be the installer (a sign-in portal's page) before it is hashed.
     $maximumInstallerBytes = 8MB

install.py

@@ -6548,8 +6548,6 @@ def apply_record(args: argparse.Namespace, plat: str, folder: Path) -> dict | No
     return setup
 
 
-
-
 def _is_link(info: os.stat_result) -> bool:
     """Whether what lstat read is a link: a symbolic link, or on Windows a
     junction or any other reparse point."""

install.sh

@@ -23,7 +23,7 @@ DEFAULT_INSTALL_URL="https://raw.githubusercontent.com/Abdess/retrobios/main/ins
 # curl or wget stop on a cut transfer before the hash is read: the site's
 # build rewrites this line there (scripts/sitebootstrap.py).
 MISMATCH_ADVICE="The download was most likely cut short: try again. Within minutes of an update of this project the two files can come from caches of different ages. Waiting five minutes settles that."
-DEFAULT_INSTALL_SHA256="000880ee7a1293a5a3bc868b6bf7f3a4f262b61c485564cc11b433908acca817"
+DEFAULT_INSTALL_SHA256="26fef8daf6087201d43e1c1cb5b69e255358f38f28ca1e45782984a0240dc7d3"
 # The pin above refuses any changed byte: this cap only stops a body that
 # cannot be the installer (a sign-in portal's page) before it is hashed.
 MAX_INSTALLER_BYTES=8388608

install/launchers/index.json

@@ -27,8 +27,8 @@
         {
           "dest": "roms/ports/retrobios/install.py",
           "repo_path": "install.py",
-          "size": 1285764,
-          "sha256": "000880ee7a1293a5a3bc868b6bf7f3a4f262b61c485564cc11b433908acca817",
+          "size": 1285762,
+          "sha256": "26fef8daf6087201d43e1c1cb5b69e255358f38f28ca1e45782984a0240dc7d3",
           "executable": false
         },
         {
@@ -71,8 +71,8 @@
     "muos": {
       "archive": {
         "dest": "ARCHIVE/RetroBIOS.muxapp",
-        "size": 1339389,
-        "sha256": "e305f03c65adbf3cf4eab08eaad2091bc52afa397c81895679d6172ca12ba061"
+        "size": 1339387,
+        "sha256": "7060180b1a8d93573eee7a7a083a3903822743f52d8a06a9691b40a04ecbafb6"
       },
       "members": [
         {
@@ -92,8 +92,8 @@
         {
           "name": "RetroBIOS/install.py",
           "repo_path": "install.py",
-          "size": 1285764,
-          "sha256": "000880ee7a1293a5a3bc868b6bf7f3a4f262b61c485564cc11b433908acca817",
+          "size": 1285762,
+          "sha256": "26fef8daf6087201d43e1c1cb5b69e255358f38f28ca1e45782984a0240dc7d3",
           "executable": false
         },
         {
@@ -166,8 +166,8 @@
         {
           "dest": ".config/modules/retrobios/install.py",
           "repo_path": "install.py",
-          "size": 1285764,
-          "sha256": "000880ee7a1293a5a3bc868b6bf7f3a4f262b61c485564cc11b433908acca817",
+          "size": 1285762,
+          "sha256": "26fef8daf6087201d43e1c1cb5b69e255358f38f28ca1e45782984a0240dc7d3",
           "executable": false
         },
         {