fix: name --offline when given, keep page budget

--offline given with the variable set is named as the option, and the
runs the screen starts get it only when the user gave it. The first
install page stays under its 400 words, the 3.8 runs skip only the
pack test that needs generate_pack.

install.py

@@ -10274,9 +10274,9 @@ def main() -> None:
         ):
             if given:
                 parser.error(reason)
-    if args.offline and not offline_requested():
+    if args.offline:
         # The runs the full-screen interface starts read it from here, and
-        # the words name the option, not a variable nobody set.
+        # the words name the option given.
         os.environ[OFFLINE_VARIABLE] = OFFLINE_FLAG_VALUE
     if offline_requested() and (args.target or args.list_targets):
         parser.error("--target and --list-targets read a core list from the network, "
@@ -13246,7 +13246,10 @@ def tui_flags(state: TuiState) -> list[tuple[str, str | None]]:
     if state.jobs != 8:
         flags.append(("--jobs", str(state.jobs)))
     flags += [("--from", str(folder)) for folder in state.from_folders]
-    if offline_requested() and not any(flag == "--offline" for flag, _v in flags):
+    if (os.environ.get(OFFLINE_VARIABLE) == OFFLINE_FLAG_VALUE
+            and not any(flag == "--offline" for flag, _v in flags)):
+        # Given as --offline: said so in the command. Set as the variable,
+        # the runs inherit it and the words name it.
         flags.append(("--offline", None))
     return flags