fix OWNERS path

The find owners module will use the path in the current repo as the
implicit prefix even when crossing repo boundaries, so make sure we
have an explicit / anchor when loading from chromite.  It doesn't
make a difference in this repo, but might as well avoid copy & paste
confusion.

BUG=None
TEST=find owners can find owners for this

Change-Id: Ie94e555d39c7d4ef9f6f09e6a90c5875e4077419
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/repohooks/+/2332369
Tested-by: Mike Frysinger <vapier@chromium.org>
Auto-Submit: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Stephane Belmon <sbelmon@google.com>
Commit-Queue: Stephane Belmon <sbelmon@google.com>
diff --git a/OWNERS b/OWNERS
index 5d3a805..592f350 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,3 +1,3 @@
-include chromiumos/chromite:OWNERS.build
+include chromiumos/chromite:/OWNERS.build
 
 # COMPONENT: Infra>ChromeOS>Build>Platform