Fix disabling extensions in application builder

Co-authored-by: Alex Andreev <alex.andreev.email@gmail.com>

Signed-off-by: Janne Savolainen <janne.savolainen@live.fi>

src/renderer/components/test-utils/get-application-builder.tsx

@@ -556,7 +556,7 @@ const disableExtensionsFor = <T extends ObservableSet>(
       runInAction(() => {
         extension.deregister();
 
-        extensionState.delete(extension);
+        extensionState.delete(instance);
       });
     });
   };