Remove "blueish" correction

It's not a typo, or a correction that really needs to be made, as both
"blueish" and "bluish" are acceptable forms:
https://english.stackexchange.com/questions/18824/why-are-blueish-and-bluish-both-considered-correct-spellings

Closes: codespell-project#3509

codespell_lib/data/dictionary_usage.txt

@@ -2,7 +2,6 @@ black-hat->malicious actor, attacker,
 blackhat->malicious actor, attacker,
 blacklist->blocklist
 blacklists->blocklists
-blueish->bluish
 cripples->slows down, hinders, obstructs,
 crippling->attenuating, incapacitating,
 dummy-value->placeholder value