display: do not wipe the status bar when --zero or --minibar is active

With --zero, any message that was there will get overwitten by the
text window anyway as result of the current operation.  And with
--minibar, any message will get overwritten with the minibar.

This fixes https://savannah.gnu.org/bugs/?61539.

Bug existed since commit 03637030 from two weeks ago.

src/winio.c

@@ -1673,6 +1673,9 @@ void blank_statusbar(void)
 /* Wipe the status bar clean and include this in the next screen update. */
 void wipe_statusbar(void)
 {
+	if (ISSET(ZERO) || ISSET(MINIBAR) || LINES == 1)
+		return;
+
 	blank_row(bottomwin, 0);
 	wnoutrefresh(bottomwin);
 	lastmessage = VACUUM;