Make PPSSPP visible in OUYA launcher

Reference: https://github.com/ouya/docs/blob/master/setup.md

android/AndroidManifest.xml

@@ -54,6 +54,7 @@
 
                 <category android:name="android.intent.category.LAUNCHER" />
                 <category android:name="android.intent.category.LEANBACK_LAUNCHER" />
+                <category android:name="tv.ouya.intent.category.GAME"/>
             </intent-filter>
             <intent-filter>
 				<action android:name="android.intent.action.VIEW" />