Change the resource qualifier height & width

Tablet two pane's landscape width from 840dp to 800dp

Bug: 193374285
Test: Manual
Change-Id: I285cb6d143b268a22cac2f59e5735044533c7dba
diff --git a/res/values-w840dp/dimens.xml b/res/values-w800dp/dimens.xml
similarity index 100%
rename from res/values-w840dp/dimens.xml
rename to res/values-w800dp/dimens.xml