search: wipe the status bar before searching again (M-W / M-Q)

So that any message that is on the status bar after the search
will be a response to this search and not some leftover.

This fixes https://savannah.gnu.org/bugs/?56737.

src/search.c

@@ -359,6 +359,8 @@ void do_research(void)
 	/* Use the search-menu key bindings, to allow cancelling. */
 	currmenu = MWHEREIS;
 
+	wipe_statusbar();
+
 	go_looking();
 
 	tidy_up_after_search();