ci(gpu): mark the app as a game so macOS Game Mode can activate

Set LSApplicationCategoryType=public.app-category.games in the bundle
Info.plist so running the Fullscreen display mode frontmost triggers
macOS Game Mode.

Author: Mearman

.github/workflows/macos-build-gpu.yml

@@ -330,6 +330,7 @@ jobs:
             <key>CFBundleShortVersionString</key><string>1.0.0</string>
             <key>CFBundleExecutable</key><string>$APP_NAME</string>
             <key>CFBundlePackageType</key><string>APPL</string>
+            <key>LSApplicationCategoryType</key><string>public.app-category.games</string>
             <key>LSMinimumSystemVersion</key><string>26.0</string>
             <key>NSHighResolutionCapable</key><true/>
           </dict></plist>