faces/totp: fix error message not displayed bug

faces/totp: fix error message not displayed bug

Forgot to call watch_display_string on the error message.
Of course the message isn't going to be displayed.

Also, increase the buffer size to 10 characters
and output a space to the last position.
This ensures the segments are cleared.

Tested-by: Matheus Afonso Martins Moreira <matheus.a.m.moreira@gmail.com>
Tested-on-hardware-by: madhogs <59648482+madhogs@users.noreply.github.com>
Signed-off-by: Matheus Afonso Martins Moreira <matheus.a.m.moreira@gmail.com>
GitHub-Pull-Request: https://github.com/joeycastillo/Sensor-Watch/pull/385