move commandAction out of CmdLine.Seek

This is groundwork for nested seek loops, eg seeking over all files and
then performing commandActions on a list of remotes, which can be done
concurrently.

This commit was sponsored by Boyd Stephen Smith Jr. on Patreon.

Command/TransferKey.hs

@@ -42,7 +42,7 @@ instance DeferredParseClass TransferKeyOptions where
 		<*> pure (fileOption v)
 
 seek :: TransferKeyOptions -> CommandSeek
-seek o = withKeys (start o) (keyOptions o)
+seek o = withKeys (commandAction . start o) (keyOptions o)
 
 start :: TransferKeyOptions -> Key -> CommandStart
 start o key = case fromToOptions o of