Revert "set CUSTOM before getting currentSidebarContents"

This reverts commit 5dde0c74215c3088178d00863c39994ef0a772e9.

packages/app/src/stores/ui.tsx

@@ -267,7 +267,7 @@ export const useSidebarCollapsed = (initialData?: boolean): SWRResponse<boolean,
 };
 
 export const useCurrentSidebarContents = (initialData?: SidebarContentsType): SWRResponse<SidebarContentsType, Error> => {
-  return useStaticSWR('sidebarContents', initialData, { fallbackData: SidebarContentsType.CUSTOM });
+  return useStaticSWR('sidebarContents', initialData, { fallbackData: SidebarContentsType.TREE });
 };
 
 export const useCurrentProductNavWidth = (initialData?: number): SWRResponse<number, Error> => {