chore: remove unused code

Author: jooy2

src/renderer/utils/helper.ts

@@ -1,4 +1,4 @@
-export const openExternalLink = (ev, link): void => {
+export const openExternalLink = (ev, link: string): void => {
   if (ev) {
     ev.preventDefault();
   }
@@ -17,5 +17,3 @@ export const isDarkMode = (theme): boolean => {
 
 export const arrWithNumber = (start: number, end: number): number[] =>
   Array.from({ length: end - start + 1 }, (_, i) => i + start);
-
-export default {};