Fixed bug where user password was never saved

src/user_management/pages/settings.gmi

@@ -1,3 +0,0 @@
-Welcome {username}!
-
-=> {redirect} Back to app

src/user_management/user.rs

@@ -297,6 +297,7 @@ impl<UserData: Serialize + DeserializeOwned> RegisteredUser<UserData> {
             )?,
             salt,
         ));
+        self.has_changed = true;
         Ok(())
     }