Doom 3: add exit 0 to uninstall cleanly

apps/Doom 3/uninstall

@@ -14,4 +14,8 @@ if [ -d ~/RPIDoom3Installer ];then
   cd ~/RPIDoom3Installer || "Failed to Change directory"
   echo "Running uninstall script..."
   ./uninstall.sh || error "Failed to execute uninstall script :("
+else
+  echo "WARNING: Doing nothing as ~/RPIDoom3Installer folder does not exist!"
 fi
+
+exit 0