Correctly update extensions language selection

Was only updated after clicking "OK" once.
This was caused due only updating the language selection once the app language was changed or in case the selected languages (after clicking "OK") changed

src/screens/Extensions.tsx

@@ -165,7 +165,7 @@ export default function MangaExtensions() {
                 <LangSelect shownLangs={shownLangs} setShownLangs={setShownLangs} allLangs={allLangs} />
             </>,
         );
-    }, [t, shownLangs]);
+    }, [t, shownLangs, allLangs]);
 
     useEffect(() => {
         const dropHandler = async (e: Event) => {