fix: Increase max arguments for /connect to 9

The /connect command supports several optional parameters
server, port, tls, and auth.

This was implemented in ac410445af but
this change in the command definitions probably were forgotten.

src/command/cmd_defs.c

@@ -143,7 +143,7 @@ static const struct cmd_t command_defs[] = {
     },
 
     { CMD_PREAMBLE("/connect",
-                   parse_args, 0, 7, NULL)
+                   parse_args, 0, 9, NULL)
       CMD_MAINFUNC(cmd_connect)
       CMD_TAGS(
               CMD_TAG_CONNECTION)