Fix crash in watch-local

Author: weswigham

Gulpfile.js

@@ -542,7 +542,7 @@ const watchLocalPatterns = [
 gulp.task(
     "watch-local",
     "Watches for changes to projects in src/ (but does not execute tests).",
-    () => gulp.watch(watchLocalPatterns, "local"));
+    () => gulp.watch(watchLocalPatterns, ["local"]));
 
 const watchPatterns = [
     "src/tsconfig-base.json",
@@ -632,4 +632,4 @@ gulp.task(
         "clean:scripts",
         "clean-rules",
         "clean-built"
-    ]);
+    ]);