Start tmate after the config files are processed

Closes #50

cfg.c

@@ -26,6 +26,7 @@
 #include <string.h>
 
 #include "tmux.h"
+#include "tmate.h"
 
 struct cmd_q		*cfg_cmd_q;
 int			 cfg_finished;
@@ -122,6 +123,8 @@ cfg_default_done(unused struct cmd_q *cmdq)
 		return;
 	cfg_finished = 1;
 
+	tmate_session_start();
+
 	if (!RB_EMPTY(&sessions))
 		cfg_show_causes(RB_MIN(sessions, &sessions));
 

server.c

@@ -205,7 +205,7 @@ server_start(int lockfd, char *lockfile)
 
 	set_signals(server_signal_callback);
 
-	tmate_session_start();
+	/* tmate_session_start() is called in cfg_default_done */
 	server_loop();
 	exit(0);
 }