Ticket #1582: fixed screen flickering on updates.

Partial revert of 4e40f6e98f2036cc8893e581cf52cdf5c239064e.
Don't call tty_touch_screen() for each screen repaint.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>

src/cmd.c

@@ -47,7 +47,7 @@
 
 #include "global.h"
 
-#include "../src/tty/tty.h"		/* LINES */
+#include "../src/tty/tty.h"		/* LINES, tty_touch_screen() */
 #include "../src/tty/key.h"		/* ALT() macro */
 #include "../src/tty/win.h"		/* do_enter_ca_mode() */
 
@@ -892,6 +892,7 @@ history_cmd (void)
 void swap_cmd (void)
 {
     swap_panels ();
+    tty_touch_screen ();
     repaint_screen ();
 }
 

src/layout.c

@@ -587,7 +587,6 @@ void
 repaint_screen (void)
 {
     do_refresh ();
-    tty_touch_screen ();
     tty_refresh ();
 }