Some image file path has "=" character

[fetus-hina]

Maybe it caused by Base32 encoder's bug.

[fetus-hina]

SELECT COUNT(*) ​FROM battle_image WHERE filename !~ '^[a-z2-7]{2}/[a-z2-7]{26}.jpg => 203 (of ~5200000)
SELECT COUNT(*) ​FROM battle_image2 WHERE filename !~ '^[a-z2-7]{2}/[a-z2-7]{26}.jpg => 55388 (of ~4250000)
SELECT COUNT(*) FROM user_icon WHERE filename !~ '^[a-z2-7]{2}/[a-z2-7]{26}.png' => 12 (of ~2100)