template-lint: Enable no-implicit-this rule

Author: Turbo87

.template-lintrc.js

@@ -9,6 +9,5 @@ module.exports = {
     'require-valid-alt-text': false,
     'no-action': false,
     'no-curly-component-invocation': false,
-    'no-implicit-this': false,
   },
 };