Trim whitespace before paste in digit code input #23

Currently, if somebody copied a code and has accidental whitespace, nothing will be copied when the input is a digit-only input.

I would suggest that on paste, depending if the input is digit-only, whitespace in front and after will be trimmed.

Example:
Clipboard value is " 123 ", before trying to paste the text into the input field trim the data to be "123" and then try, if it is allowed.