Make validation to accept only integer values in config form

Fixed the above issue and provided patch.

Rajan Kumar → made their first commit to this issue’s fork.

I have review & committed above patch in latest version.

I have observed that when i'm giving integer value in menu title length it allows to save that value but when i'm giving string value in menu title length then it doesn't allow it to save string value. Validation part is working fine .

@Shreya_th this ticket has already closed.