DevTools: Hide the icon!

Change default category of the main activity to DEFAULT
instead of LAUNCHER.

Change-Id: I25ed302ea3eedb93b5119a83f08b6d50aaecce08

Author: chirayudesai

apps/Development/AndroidManifest.xml

@@ -57,7 +57,7 @@
             android:icon="@mipmap/ic_launcher_devtools">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
-                <category android:name="android.intent.category.LAUNCHER" />
+                <category android:name="android.intent.category.DEFAULT" />
             </intent-filter>
         </activity>
         <activity android:name="PackageBrowser" android:label="Package Browser">