ui/run-dev-server: propagate additional flags to underlying script

Change-Id: I291e47a2204e6358d417f8c6ac960f8188d451be
diff --git a/ui/run-dev-server b/ui/run-dev-server
index 6de8927..201ed63 100755
--- a/ui/run-dev-server
+++ b/ui/run-dev-server
@@ -14,4 +14,4 @@
 # limitations under the License.
 
 UI_DIR="$(cd -P ${BASH_SOURCE[0]%/*}; pwd)"
-$UI_DIR/node $UI_DIR/build.js --serve --watch
+$UI_DIR/node $UI_DIR/build.js --serve --watch "$@"