Fix missing exported=true in manifest.

Fixes: 194858181
Test: clean build, then `adb shell pm list packages | grep egg`
Change-Id: Ia45a8c28c76b52f8350500c60fb7b85706b82d63

packages/EasterEgg/AndroidManifest.xml

@@ -134,6 +134,7 @@
         <receiver
             android:name=".widget.PaintChipsWidget"
             android:label="@string/s_egg_name"
+            android:exported="true"
             android:enabled="false">
             <intent-filter>
                 <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
@@ -145,4 +146,4 @@
         </receiver>
     </application>
 
-</manifest>
+</manifest>