can't add negative time offset

[olafbooij]

Since daylight saving kicked in the app generates wrong codes. If I set the time of my nokia 3310 an hour back the app works fine (but my friends complain I'm always late...).
Using the time correction I seem to be able to add seconds, but not remove them. That is: when filling in the time correction I can only add digits, not a minus sign.

I could perhaps use a 2^32 - 3600 (I didn't try that yet...) as a work around. But it would be quite tedious to add this for all my profiles.

Are there any other ideas how to fix this. If not then I can try to create a PR to add an additional negative-offset box.

Very happy btw with this 2FA-app on my nokia!!