Bug 1709672 - [devtools] Do not await on synchronous _stopListening method. r=nchevobbe

Differential Revision: https://phabricator.services.mozilla.com/D114412

devtools/shared/commands/resource/resource-command.js

@@ -324,7 +324,7 @@ class ResourceCommand {
         }
 
         if (this._shouldRestartListenerOnTargetSwitching(resourceType)) {
-          await this._stopListening(resourceType, {
+          this._stopListening(resourceType, {
             bypassListenerCount: true,
           });
           resources.push(resourceType);