fix(repo): drop orphaned error code and dead voice clause (#3376)

fluxer_admin/openapi-admin.json

@@ -17244,7 +17244,6 @@
 					"CANNOT_SEND_MESSAGES_IN_NON_TEXT_CHANNEL",
 					"CANNOT_SEND_MESSAGES_TO_USER",
 					"CANNOT_TRANSFER_OWNERSHIP_TO_BOT",
-					"CANNOT_SHRINK_RESERVED_SLOTS",
 					"CAPTCHA_REQUIRED",
 					"CHANNEL_ALREADY_FOLLOWED",
 					"CHANNEL_HAS_FOLLOWED_CHANNELS",
@@ -17541,7 +17540,6 @@
 					"You can't send messages in a non-text channel.",
 					"You can't send messages to this user.",
 					"Community ownership can't be transferred to a bot.",
-					"You can't shrink reserved slots.",
 					"Verification required. Try again.",
 					"This channel already receives updates from that announcement channel.",
 					"Remove the followed channels posting here before converting it to an announcement channel.",