perf: Shut up another eslint error

The functions here are asynchronous to handle control back to the
mainloop while waiting for an action to complete, not to run operations
in parallel. That is, the race condition the rule is protecting against
isn't an issue here, so disable the error.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/627

js/perf/core.js

@@ -126,9 +126,11 @@ function *run() {
 
     for (let i = 0; i < 2; i++) {
         Scripting.scriptEvent('applicationsShowStart');
+        // eslint-disable-next-line require-atomic-updates
         Main.overview._dash.showAppsButton.checked = true;
         yield Scripting.waitLeisure();
         Scripting.scriptEvent('applicationsShowDone');
+        // eslint-disable-next-line require-atomic-updates
         Main.overview._dash.showAppsButton.checked = false;
         yield Scripting.waitLeisure();
     }

js/perf/hwtest.js

@@ -126,6 +126,7 @@ function *run() {
     yield Scripting.sleep(1000);
 
     Scripting.scriptEvent('applicationsShowStart');
+    // eslint-disable-next-line require-atomic-updates
     Main.overview._dash.showAppsButton.checked = true;
 
     yield Scripting.waitLeisure();