CI: Remove AppRun hook from cross AppImage

We handle setting QT_QPA_PLATFORMTHEME early during startup.

scripts/appimage/apprun-cross.sh

@@ -1,21 +0,0 @@
-#! /usr/bin/env bash
-
-# autogenerated by linuxdeploy
-
-# make sure errors in sourced scripts will cause this script to stop
-set -e
-
-this_dir="$(readlink -f "$(dirname "$0")")"
-
-# generated by linuxdeploy-plugin-qt
-
-# try to make Qt apps more "native looking" on Gtk-based desktops, if possible
-# see https://github.com/AppImage/AppImageKit/issues/977#issue-462374883
-case "${XDG_CURRENT_DESKTOP}" in
-    *GNOME*|*gnome*|*XFCE*)
-        export QT_QPA_PLATFORMTHEME=gtk3
-        ;;
-esac
-
-exec "$this_dir"/AppRun.wrapped "$@"
-

scripts/appimage/make-cross-appimage.sh

@@ -325,10 +325,8 @@ echo "Generating AppStream metainfo..."
 mkdir -p "$OUTDIR/usr/share/metainfo"
 "$SCRIPTDIR/generate-metainfo.sh" "$OUTDIR/usr/share/metainfo"
 
-# Copy AppRun
-cp "$SCRIPTDIR/apprun-cross.sh" "$OUTDIR/AppRun"
-chmod +x "$OUTDIR/AppRun"
-ln -s "usr/bin/$BINARY" "$OUTDIR/AppRun.wrapped"
+# Link AppRun to main binary.
+ln -s "usr/bin/$BINARY" "$OUTDIR/AppRun"
 
 echo "Generating AppImage..."
 rm -f "$APPIMAGENAME.AppImage"