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

@@ -1,6 +1,5 @@
 blacklist->blocklist
 blacklists->blocklists
-blueish->bluish
 man-in-the-middle->on-path attacker
 master->primary, leader, active, writer, coordinator, parent, manager, main,
 masters->primaries, leaders, actives, writers, coordinators, parents, managers,