package.json: remove empty dependencies list

If no packages are depended on for production
usage, no need to include an empty list

Change-Id: Ia4dc25168db7da4f9744f7cee5c02202fd4f9f2a

package.json

@@ -12,6 +12,5 @@
 		"grunt-stylelint": "0.16.0",
 		"stylelint-config-wikimedia": "0.10.3",
 		"svgo": "2.3.0"
-	},
+	}
-	"dependencies": {}
 }