[widgets][assetbrowser] Code simplification

beat/editor/widgets/assetbrowser.py

@@ -149,6 +149,5 @@ class AssetBrowser(QWidget):
 
         prefix_root_path = context.meta["config"].path
 
-        self.filesystem_model.setRootPath(prefix_root_path)
-        root_index = self.filesystem_model.index(prefix_root_path)
+        root_index = self.filesystem_model.setRootPath(prefix_root_path)
         self.view.setRootIndex(self.proxy_model.mapFromSource(root_index))