Fix "extension" root route redirect

Not sure why this redirects to the root route instead of to the extension page (got introduced in 2e105a0539)

src/App.tsx

@@ -167,7 +167,7 @@ const MainApp = () => {
                         <Route path={AppRoutes.sources.childRoutes.searchAll.match} element={<SearchAll />} />
                     </Route>
                     <Route path={AppRoutes.extension.match}>
-                        <Route index element={<Navigate to={AppRoutes.root.path} replace />} />
+                        <Route index element={<Navigate to={AppRoutes.browse.path(BrowseTab.EXTENSIONS)} replace />} />
                         <Route path={AppRoutes.extension.childRoutes.info.match} element={<ExtensionInfo />} />
                     </Route>
                     <Route path={AppRoutes.downloads.match} element={<DownloadQueue />} />