Start immediately with the main screen (#497)

There is little point in delaying startup when there are no
"interesting" messages. Remove sleep(1); the user can still request a
verbose run with `tlf -v` (this is the default on the first startup
anyway).

When having to restart tlf during a contest (after changing some setting
for example), that second actually makes a difference.

Author: df7cb

src/showmsg.c

@@ -42,8 +42,6 @@ void clearmsg_wait(void) {
 	move(LINES - 1, 0);
 	clrtoeol();
 	IGNORE(key_get());
-    } else {
-	sleep(1);
     }
     clearmsg();
 }