give poll result backgrounds a rounded shape (#1626)

* give poll result backgrounds a rounded shape

* fix rtl layout of poll options

app/src/main/res/drawable/poll_option_background.xml

@@ -3,4 +3,4 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:drawable="@drawable/poll_option_shape"
     android:clipOrientation="horizontal"
-    android:gravity="left|clip_horizontal|fill_vertical"/>
+    android:gravity="start|clip_horizontal|fill_vertical"/>

app/src/main/res/drawable/poll_option_shape.xml

@@ -2,5 +2,6 @@
 <shape
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:shape="rectangle">
+    <corners android:radius="6dp"/>
     <solid android:color="?attr/pollOptionBackgroundColor" />
 </shape>

app/src/main/res/layout/item_poll.xml

@@ -17,6 +17,7 @@
         android:paddingTop="2dp"
         android:paddingEnd="6dp"
         android:paddingBottom="2dp"
+        android:textAlignment="viewStart"
         android:textColor="?android:attr/textColorPrimary"
         android:textSize="?attr/status_text_medium"
         tools:text="40%" />