project.config: Make +2's sticky (again).

The changes:
https://dawn-review.googlesource.com/c/dawn/+/69404
https://dawn-review.googlesource.com/c/tint/+/69405

Changed the behavior of +2s, and now the "Code-Review" label is
dropped with trivial changes. The old behavior for both the 'dawn'
and 'tint' repos was to keep the +2. This CL restores that behavior.

Bug: b/203790428
Change-Id: I46a3393c58244763b09c612fdcd6d35ab9c837f1
diff --git a/project.config b/project.config
index 17d273e..78816cb 100644
--- a/project.config
+++ b/project.config
@@ -64,9 +64,12 @@
 	function = NoBlock
 [label "Code-Review"]
 	function = MaxWithBlock
+	abbreviation = R
 	defaultValue = 0
 	copyMinScore = true
+	copyMaxScore = true
 	copyAllScoresOnTrivialRebase = true
+	copyAllScoresIfNoCodeChange = true
 	value = -2 Do not submit
 	value = -1 I would prefer that you didn't submit this
 	value = 0 No score