Delete badge_without_number.xml

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

-<?xml version="1.0" encoding="utf-8"?>
-<shape xmlns:android="http://schemas.android.com/apk/res/android"
-        android:shape="oval">
-    <solid android:color="@color/badge_color" />
-    <size android:width="@dimen/badge_size" android:height="@dimen/badge_size"/>
-</shape>
\ No newline at end of file