Display the email no the name on the profile button

src/app/login/login.component.html

@@ -16,7 +16,7 @@
 		<mat-icon>vpn_key</mat-icon>
 	</button>
 	<button mat-button (click)="dialog.openProfile()">
-		{{ userService.user?.username }}
+		{{ userService.user?.email }}
 	</button>
 	<button mat-raised-button color="accent" (click)="userService.logout()">Logout</button>
 </span>