fix(YouTube - Custom Branding): Resolve startup crash with root installation

Author: LisoUseInAIKyrios

extensions/shared/library/src/main/java/app/revanced/extension/shared/GmsCoreSupport.java

@@ -261,7 +261,6 @@ private static String getGmsCoreDownload() {
     }
 
     private static String getGmsCoreVendorGroupId() {
-        // Modified during patching.
-        throw new IllegalStateException();
+        return "app.revanced"; // Modified during patching.
     }
 }