Fix /correct quotation marks usage

Add new `parse_args_as_one()` function to just use everything after the
command as the argument.

Fix https://github.com/profanity-im/profanity/issues/1404

src/command/cmd_ac.c

@@ -4189,7 +4189,6 @@ _lastactivity_autocomplete(ProfWin* window, const char* const input, gboolean pr
         if (result) {
             return result;
         }
-
     }
 
     return NULL;