tooltips: Fix incorrect "required" tooltip on custom profile fields.

Previously, "This profile field is required." tooltip was visible on
all custom profile fields, including those that were not required.
This commit fixes that by targeting only the required fields.

web/src/tippyjs.ts

@@ -612,7 +612,7 @@ export function initialize(): void {
     });
 
     delegate("body", {
-        target: ".custom-user-field-label-wrapper",
+        target: ".custom-user-field-label-wrapper.required-field-wrapper",
         content: $t({
             defaultMessage: "This profile field is required.",
         }),