jshint: Fix trailing comma

Due to the "es5: true" jshint option we enabled, these
warnings were surpressed. I've disabled the option since
we no longer require it. It was enabled in 07c86fc to fix
a bug with jshint. This bug has now been fixed.

Change-Id: I55b7d031eb5581af5f733f050cf2ea98dacb2af6