Update js/index.js

Co-authored-by: Copilot <[email protected]>

Author: RKBoss6

js/index.js

@@ -1460,7 +1460,7 @@ settingsCheckbox("settings-autoReload", "autoReload");
 settingsCheckbox("settings-nopacket", "noPackets");
 loadSettings();
 
-selectTheme = document.getElementById("settings-theme");
+const selectTheme = document.getElementById("settings-theme");
 // Update theme selector
 selectTheme.value = SETTINGS.theme;
 selectTheme.addEventListener("change",event=>{