Revert "fix: Await full sync stop before closing the app (#2300)" (#2302

)

This reverts commit 0901d11.

By awaiting the full sync stop, we prevent quitting the app during a
synchronisation or a watcher run while these can take a very long time
(especially the first scan of local and remote changes).

We'll bring back this behavior once we have a way to cancel the
on-going sync and watch runs.

gui/js/tray.window.js

@@ -275,13 +275,9 @@ module.exports = class TrayWM extends WindowManager {
       },
       'auto-launcher': (event /*: ElectronEvent */, enabled /*: boolean */) =>
         autoLaunch.setEnabled(enabled),
-      'close-app': async () => {
-        try {
-          await this.desktop.stopSync()
-          await this.app.quit()
-        } catch (err) {
-          log.error({ err, sentry: true }, 'error while quitting client')
-        }
+      'close-app': () => {
+        this.desktop.stopSync()
+        this.app.quit()
       },
       'unlink-cozy': () => {
         if (!this.desktop.config.isValid()) {