Fix scrollbar layout for RTL

Scrollbar dimensions were set incorrectly to larger numbers than
expected that was showing the thumb too big on the screen.

Bug: 169548155
Test: manual

Change-Id: Ica7a2488a8e84869906972a71a4a5c876be86061
diff --git a/car-ui-lib/referencedesign/res/values-ldrtl/values.xml b/car-ui-lib/referencedesign/res/values-ldrtl/values.xml
index 60df94e..24552a5 100644
--- a/car-ui-lib/referencedesign/res/values-ldrtl/values.xml
+++ b/car-ui-lib/referencedesign/res/values-ldrtl/values.xml
@@ -4,9 +4,9 @@
 
     <dimen name="car_ui_scrollbar_margin">112dp</dimen>
     <dimen name="car_ui_scrollbar_container_width">112dp</dimen>
-    <dimen name="car_ui_scrollbar_button_size">112dp</dimen>
-    <dimen name="car_ui_scrollbar_thumb_width">112dp</dimen>
-    <dimen name="car_ui_scrollbar_separator_margin">112dp</dimen>
+    <dimen name="car_ui_scrollbar_button_size">76dp</dimen>
+    <dimen name="car_ui_scrollbar_thumb_width">7dp</dimen>
+    <dimen name="car_ui_scrollbar_separator_margin">16dp</dimen>
 
     <string name="car_ui_scrollbar_page_up_button">Scroll up</string>
     <string name="car_ui_scrollbar_page_down_button">Scroll down</string>