frontend: fix no-param-reassign error

Fixed lint no-param-reassign error that was enabled in last commit.

Author: thisconnect

frontends/web/src/utils/walletconnect.ts

@@ -108,21 +108,21 @@ export const rejectMessage = (id: number) => {
 };
 
 export const decodeEthMessage = (hex: string) => {
-  hex = hex.trim();
-  if (hex.startsWith('0x')) {
-    hex = hex.substring(2);
+  let message = hex.trim();
+  if (message.startsWith('0x')) {
+    message = message.substring(2);
   }
 
   // Validate input.
-  if (hex.length % 2 !== 0 || !/^[0-9a-fA-F]*$/.test(hex)) {
+  if (message.length % 2 !== 0 || !/^[0-9a-fA-F]*$/.test(message)) {
     console.error('Invalid hex string');
     return null;
   }
 
   // Create a Uint8Array from the hex string.
-  const bytes = new Uint8Array(hex.length / 2);
+  const bytes = new Uint8Array(message.length / 2);
   for (let i = 0; i < bytes.length; i++) {
-    const byte = parseInt(hex.substring(i * 2, i * 2 + 2), 16);
+    const byte = parseInt(message.substring(i * 2, i * 2 + 2), 16);
     if (isNaN(byte)) {
       console.error('Invalid byte in hex string');
       return null;