DEV: Correct linting error

approved
#1

DEV: Correct linting error

diff --git a/app/assets/javascripts/discourse/lib/screen-track.js.es6 b/app/assets/javascripts/discourse/lib/screen-track.js.es6
index 3ca2a39..a9e851f 100644
--- a/app/assets/javascripts/discourse/lib/screen-track.js.es6
+++ b/app/assets/javascripts/discourse/lib/screen-track.js.es6
@@ -154,7 +154,6 @@ export default class {
           }
         })
           .then(() => {
-            const controller = this._topicController;
             if (controller) {
               const postNumbers = Object.keys(newTimings).map(v =>
                 parseInt(v, 10)

GitHub sha: f1d5b992

Approved #2