Fix initialState useDarkLight in loggedinbutton.jsx

Resolved the issue where the light mode button was incorrectly displayed upon hovering over the avatar in light mode. Adjusted the code to now show the dark mode button as expected when hovering over the avatar. This commit addresses the problem reported in [Issue #245](#245).

src/components/login/loggedinbutton.jsx

@@ -10,7 +10,7 @@ import { useSelectedLayoutSegments } from "next/navigation";
 
 function useDarkLight() {
   const [activeTheme, setActiveTheme] = useState(
-    document?.body?.dataset?.theme? document.body.dataset.theme: "light",,
+    document?.body?.dataset?.theme || "light",
   );
   const inactiveTheme = activeTheme === "light" ? "dark" : "light";
   //...