Bug 1279336 - Explicitly do not scale smartfolder icons. r=jonalmeida

MozReview-Commit-ID: 9TEiecbLoy8

--HG--
extra : rebase_source : 83cfb4710dc0c3a6bf605901ed1ba004e4937430

mobile/android/base/resources/layout/home_smartfolder.xml

@@ -20,6 +20,7 @@
         android:layout_height="@dimen/favicon_bg"
         android:layout_margin="16dp"
         android:padding="2dp"
+        android:scaleType="center"
         android:layout_gravity="center_vertical"
         tools:src="@drawable/cloud"/>