in do_yesno(), allow refreshing the screen via Ctrl-L, as Pico does


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2601 35c25a1d-7b9e-4130-9fde-d3aeb78583b8
diff --git a/src/winio.c b/src/winio.c
index 865c514..4875f5f 100644
--- a/src/winio.c
+++ b/src/winio.c
@@ -3647,7 +3647,10 @@
 
 	kbinput = get_kbinput(edit, &meta_key, &func_key);
 
-	if (kbinput == NANO_CANCEL_KEY)
+	if (kbinput == NANO_REFRESH_KEY) {
+	    total_update();
+	    continue;
+	} else if (kbinput == NANO_CANCEL_KEY)
 	    ok = -1;
 #ifndef DISABLE_MOUSE
 	else if (kbinput == KEY_MOUSE) {