Fix savanna-dashboard git repo clone dest

It breaks savanna d-g jobs due to the ERROR_ON_CLONE=True in d-g
(enforce that nothing will be cloned during the installation).

Change-Id: I0531e1baf7252c31eb63ee5b46c28d1dfa7d0a1b
diff --git a/lib/savanna-dashboard b/lib/savanna-dashboard
index e967622..7713a78 100644
--- a/lib/savanna-dashboard
+++ b/lib/savanna-dashboard
@@ -29,7 +29,7 @@
 SAVANNA_PYTHONCLIENT_BRANCH=${SAVANNA_PYTHONCLIENT_BRANCH:-master}
 
 # Set up default directories
-SAVANNA_DASHBOARD_DIR=$DEST/savanna_dashboard
+SAVANNA_DASHBOARD_DIR=$DEST/savanna-dashboard
 SAVANNA_PYTHONCLIENT_DIR=$DEST/python-savannaclient
 
 # Functions