Fix clearing username

src/components/appSelectPeers.ts

@@ -478,7 +478,7 @@ export default class AppSelectPeers {
     div.dataset.key = '' + peerId;
     if(typeof(peerId) === 'number') {
       if(title === undefined) {
-        title = new PeerTitle({peerId, onlyFirstName: true}).element;
+        title = new PeerTitle({peerId, onlyFirstName: true, dialog: true}).element;
       }
 
       avatarEl.setAttribute('peer', '' + peerId);

src/components/sidebarLeft/tabs/editProfile.ts

@@ -135,7 +135,7 @@ export default class AppEditProfileTab extends SliderSuperTab {
         }));
       }
 
-      if(this.usernameInputField.isValid() && this.usernameInputField.input.classList.contains('valid')) {
+      if(this.usernameInputField.isValid() && !this.usernameInputField.input.classList.contains('error')) {
         promises.push(appUsersManager.updateUsername(this.usernameInputField.value));
       }