Restore ability for registered users to push reviews, now that CLA checks are back on. Reverts rsc's 7807e8c2ed2

Change-Id: I35b3df762d4e2055333427518e09001580c67413
Reviewed-on: https://go-review.googlesource.com/1501
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

project.config

diff --git a/project.config b/project.config
index 4b5a381..9d80cf6 100644
--- a/project.config
+++ b/project.config
@@ -23,8 +23,8 @@
 [access "refs/*"]
 	read = group Anonymous Users
 [access "refs/for/refs/*"]
-	push = group approvers
-	pushMerge = group approvers
+	push = group Registered Users
+	pushMerge = group Registered Users
 [access "refs/heads/*"]
 	create = group admins
 	forgeAuthor = group admins