Support space separated manually entered secret

[Limero]

Some websites show the TOTP secret separated with spaces, such as Gitlab.

I tried to manually add one of these secrets to Tofu and the "Done" button kept being disabled. After removing the spaces, the "Done" button could be pressed and it worked correctly.

Tofu should either strip the spaces or allow it to be added as-is to avoid confusion.

Example format of space separated secret: xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx