Fix the tray separator (#2674)

Author: keianhzo

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

@@ -2,12 +2,13 @@
 <merge xmlns:android="http://schemas.android.com/apk/res/android">
 
     <LinearLayout
-        android:layout_width="0.5dp"
+        android:layout_width="5dp"
         android:layout_height="match_parent"
+        android:gravity="center"
         android:background="@drawable/tray_background_unchecked_middle">
 
         <LinearLayout
-            android:layout_width="match_parent"
+            android:layout_width="0.5dp"
             android:layout_height="match_parent"
             android:layout_marginTop="5dp"
             android:layout_marginBottom="5dp"

app/src/main/res/values/dimen.xml

@@ -122,7 +122,7 @@
     <item name="tray_world_y" format="float" type="dimen">0.25</item>
     <item name="tray_world_z" format="float" type="dimen">-2.5</item>
     <item name="tray_world_width" format="float" type="dimen">1.42</item>
-    <dimen name="tray_width">246dp</dimen>
+    <dimen name="tray_width">255dp</dimen>
     <dimen name="tray_height">40dp</dimen>
     <item name="tray_tooltip_density" format="float" type="dimen">4.0</item>
     <dimen name="tray_tooltip_padding_h">20dp</dimen>