Update app icon path in desktop build workflow

- Update the source path for the application icon from `composeApp/logo/app_icon.png` to `composeApp/src/jvmMain/resources/logo/app_icon.png` in the AppImage build step of the desktop platforms workflow.

Author: rainxchzed

.github/workflows/build-desktop-platforms.yml

@@ -250,7 +250,7 @@ jobs:
           EOF
 
           # Copy icon to AppDir root (required by appimagetool)
-          cp composeApp/logo/app_icon.png "$APPDIR/github-store.png"
+          cp composeApp/src/jvmMain/resources/logo/app_icon.png "$APPDIR/github-store.png"
 
           # Build .AppImage
           OUTPUT="composeApp/build/compose/binaries/main/GitHub-Store-x86_64.AppImage"