fix unread count background.

rocket-chat-android-widgets/src/main/res/drawable/unread_count_background.xml

+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+  <solid android:color="#1dce73"/>
+  <corners android:radius="4dp"/>
+</shape>
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rocket-chat-android-widgets/src/main/res/layout/room_list_item.xml

@@ -31,15 +31,15 @@
       android:minWidth="20dp"
       android:layout_height="wrap_content"
       android:layout_marginStart="8dp"
-      android:padding="4dp"
+      android:padding="3dp"
       android:layout_gravity="center_vertical"
-      android:background="@color/room_list_item_unread_count_background"
+      android:background="@drawable/unread_count_background"
       >
     <TextView
         android:id="@+id/alert_count"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:textSize="12dp"
+        android:textSize="14dp"
         android:layout_gravity="center"
         android:textAppearance="@style/TextAppearance.AppCompat.Body1"
         />

rocket-chat-android-widgets/src/main/res/values/colors.xml

 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-  <color name="room_list_item_unread_count_background">#1dce73</color>
 </resources>
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