Use parse_args_with_freetext() for /correct

This commit partly reverts
8f37afcd37
Which was using a wrong approach to achieve this.

It changed parse_args() to have a -1 for infinite parameters.
But actually parse_args_with_freetext() should have been used exactly
for this behaviour.

Discovered when checking for
https://github.com/profanity-im/profanity/issues/1404

src/command/cmd_defs.c

@@ -2443,7 +2443,7 @@ static struct cmd_t command_defs[] = {
     },
 
     { "/correct",
-      parse_args, 1, -1, NULL,
+      parse_args_with_freetext, 1, 1, NULL,
       CMD_NOSUBFUNCS
       CMD_MAINFUNC(cmd_correct)
       CMD_TAGS(