Bug 1330791 - Enable the no-ex-assign rule for eslint in /services. There are no associated errors with enabling this rule. r=markh

MozReview-Commit-ID: 8AsaN1gyjkm

--HG--
extra : rebase_source : 7f35d170620ce24fff5920d9376f46fc02e3817e

services/.eslintrc.js

@@ -9,7 +9,6 @@ module.exports = {
        until they get fixed, at which point their
        respective line in this file should be removed. */
     "consistent-return": "warn",
-    "no-ex-assign": "warn",
     "no-func-assign": "warn",
     "no-native-reassign": "warn",
     "no-nested-ternary": "warn",