BUG: Percent sign

[Jarwien]

Bug
If you use in Calcy IV the IV% format as "50%" than you get a error :
File "ivcheck.py", line 78, in int_filter
raise ValueError('Unrecognised number format %s', c)
See log : https://pastebin.com/dhZ8LsjS

How to reproduce

1. Open Calcy IV
2. Go to 'Settings'
3. Open the option 'Renaming'
4. Scroll down till you see 'Formats'
5. Open the format 'IV% format'
6. Set the format on 50%
7. Do the same for 'IV% Range Format'
8. Now do the normal process to start renaming pokemon and see that there is a error

Expected result

1. That Percent sign is use-able