refactor: update index variable

Author: ArgoZhang

src/BootstrapBlazor/wwwroot/modules/utility.js

@@ -670,7 +670,7 @@ export function isMobile() {
 const hashCode = str => {
     let hash = 0;
     for (let i = 0; i < str.length; i++) {
-        const char = str.charCodeAt(1);
+        const char = str.charCodeAt(i);
         hash = (hash << 5) - hash + char;
         hash |= 0;
     }