Follow-up to f858d94, only reinitialize screen when toggling debug mode

The screen_init() call for each print() & C:o caused serious screen
artefacts in debug mode.  This patch reworks f858d94 to only re-init
screen when toggling debug.

Also, avoid screen_init() completely if started in debug mode.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

src/finit.c

@@ -303,7 +303,7 @@ int main(int argc, char* argv[])
 	conf_parse_cmdline();
 
 	/* Set up canvas */
-	if (!rescue)
+	if (!rescue && !log_is_debug())
 		screen_init();
 
 	/*