frag_call: align status and hangup button

Change-Id: I067653e1d9db78bd659596879dac17b4c1cfd983

ring-android/app/src/main/res/layout/frag_call.xml

@@ -144,6 +144,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
                 android:visibility="gone"
                 app:flexDirection="column"
                 app:flexWrap="wrap"
+                app:alignItems="stretch"
                 tools:visibility="visible">
 
                 <RelativeLayout