androidtv: reduce the bitmap size

How to test : create an account with a Profile image on TV. Start a
call to a desktop user. Look in the desktop uservcard  folder that the
vcard of TV user is still small.

Change-Id: Ibb1460f9592c194145c0d6970830d0a9724c8bdb
diff --git a/ring-android/app/src/main/res/layout/frag_call.xml b/ring-android/app/src/main/res/layout/frag_call.xml
index b671ba3..fce7e49 100644
--- a/ring-android/app/src/main/res/layout/frag_call.xml
+++ b/ring-android/app/src/main/res/layout/frag_call.xml
@@ -149,6 +149,7 @@
         android:layout_alignParentBottom="true"
         android:layout_centerInParent="true"
         android:layout_marginBottom="64dp"
+        android:contentDescription="@string/action_call_hangup"
         android:src="@drawable/ic_call_end_white"
         android:visibility="gone"
         app:backgroundTint="@color/error_red"