TOTP: Verification Should Remove Spaces

[alexclst]

When you are entering the TOTP code when verifying setup on the User Profile verification fails if there is a space anywhere in the entered text. This can happen if someone copies the code out of an app (say, Authy) where what is copied has a space between the two sets of 3 numbers of the TOTP code. The string that is entered should be stripped of all spaces before verifying it to avoid ending up with an invalid verification, when indeed the numbers were all accurate.

[kasparsd]

This is a great suggestion and usability improvement, thank you @alexclst!

[kasparsd]

Reopening since this has been overwritten in one of the recent commits.

[kasparsd]

We probably need to add trim() around the input:

https://github.com/WordPress/two-factor/blob/736473edf5ff6d2fed18ba2406c772f30950343c/providers/class-two-factor-totp.php#L294