Glimpse: Let Glimpse be launched as one of the gallery apps

Change-Id: I4f54d330ba158dad31b99e130932e28e3968d5ac
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index d72aa7e..58f8e3c 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -33,6 +33,7 @@
                 <action android:name="android.intent.action.MAIN" />
 
                 <category android:name="android.intent.category.LAUNCHER" />
+                <category android:name="android.intent.category.APP_GALLERY" />
             </intent-filter>
         </activity>
     </application>