Set .gitreview defaultbranch to bal30-dev

Change-Id: Ib57e52e98cf09f4fa3dbaa9156a4375b7dc6ee43
diff --git a/.gitreview b/.gitreview
index 84dc7a2..0fa25e5 100644
--- a/.gitreview
+++ b/.gitreview
@@ -3,3 +3,4 @@
 port=29418
 project=openolt.git
 defaultremote=origin
+defaultbranch=bal30-dev