chore(refactor): use public appConfig getter instead of private _appConfig field (#5923)

extensions/default/src/Panels/StudyBrowser/PanelStudyBrowser.tsx

@@ -87,7 +87,7 @@ function PanelStudyBrowser({
         commandsManager,
         servicesManager,
         isHangingProtocolLayout,
-        appConfig: extensionManager._appConfig,
+        appConfig: extensionManager.appConfig,
       };
 
       const handlers = customHandler?.callbacks.map(callback => callback(setupArgs));