fix: check the install record before using it

A record's choice holds only the options of the choice and their
values, or the whole record is said once and ignored: it no longer reaches
the commands printed for the user. A recorded games folder is kept only
under the folder that holds the BIOS folder. A recorded option the list
can no longer apply is left out in one line, never refused. The record is
read only when it is a regular file of at most 16 MiB, its day is unknown
when no clock can show it, one a newer installer wrote is left as it is,
and a setup that cannot be used is dropped alone. The plan opened on the
one setup found keeps that screen's notes under Details.

install/launchers/index.json

@@ -27,8 +27,8 @@
         {
           "dest": "roms/ports/retrobios/install.py",
           "repo_path": "install.py",
-          "size": 1189759,
-          "sha256": "70e71268db3c09fd3e3c9bd823bab905de73b01e95affcdae9db344a9f4087ca",
+          "size": 1201450,
+          "sha256": "37442a7c0d307b0b95a40d7630cf57025a6498fea6223076892371b2d6363147",
           "executable": false
         },
         {
@@ -71,8 +71,8 @@
     "muos": {
       "archive": {
         "dest": "ARCHIVE/RetroBIOS.muxapp",
-        "size": 1243384,
-        "sha256": "ae0d36d5f2dda70c39bfe8be474108b92f0a5a80457bc8c07d36736b09b0310d"
+        "size": 1255075,
+        "sha256": "23393eb6b88f7a7875bd034e79c02d81e80409c9403290bb96a75166bf7a60b6"
       },
       "members": [
         {
@@ -92,8 +92,8 @@
         {
           "name": "RetroBIOS/install.py",
           "repo_path": "install.py",
-          "size": 1189759,
-          "sha256": "70e71268db3c09fd3e3c9bd823bab905de73b01e95affcdae9db344a9f4087ca",
+          "size": 1201450,
+          "sha256": "37442a7c0d307b0b95a40d7630cf57025a6498fea6223076892371b2d6363147",
           "executable": false
         },
         {
@@ -166,8 +166,8 @@
         {
           "dest": ".config/modules/retrobios/install.py",
           "repo_path": "install.py",
-          "size": 1189759,
-          "sha256": "70e71268db3c09fd3e3c9bd823bab905de73b01e95affcdae9db344a9f4087ca",
+          "size": 1201450,
+          "sha256": "37442a7c0d307b0b95a40d7630cf57025a6498fea6223076892371b2d6363147",
           "executable": false
         },
         {