fix: remove unnecessary string replacement in phone number retrieval

Author: polyglot-k

src/main/java/life/mosu/mosuserver/application/notify/NotifyService.java

@@ -32,7 +32,7 @@ public class NotifyService {
             retryFor = {CustomRuntimeException.class}
     )
     public void notify(LunaNotificationEvent event) {
-        String phone = retrievePhoneNumberByUserId(event.userId()).replaceFirst("^.", "");
+        String phone = retrievePhoneNumberByUserId(event.userId());
         LunaNotificationVariable notifyVariable = notifyVariableFactory.create(event);
         NotifySender<LunaNotificationVariable> sender = senderResolver.resolve(event.status());