[Gen 4] Nicknames falsely being marked illegal

[EXEC_HARMONIOUS/.]

Nickname filters weren't introduced until Gen 5, but nicknames in my Gen 4 save files are being marked as illegal based on these future generations' standards. Please excuse the embarrassing nicknames I thought were funny when I was like, 12.

073 - LilDipshit - 594F27251D6C.pk4Fetching info... 111 - RHYPORN - E4222DB4FA35.pk4Fetching info... 252 - WTF - 4D8D4A8A4DDC.pk4Fetching info... 479 - 0123456789 - B21D61031E34.pk4Fetching info... POKEMON D.savFetching info...

[Kaphotics]

https://github.com/kwsch/PKHeX/issues/1799