tweaks: remove a superfluous condition and a redundant refresh

When 'inhelp' is true, there are at least two buffers open: an
edit buffer and the help-text buffer.

And bottombars() already does a full refresh of the bottom window.

src/files.c

@@ -636,7 +636,7 @@ void mention_name_and_linecount(void)
 void switch_to_adjacent_buffer(bool to_next)
 {
 	/* If only one file buffer is open, say so and get out. */
-	if (openfile == openfile->next && !inhelp) {
+	if (openfile == openfile->next) {
 		statusbar(_("No more open file buffers"));
 		return;
 	}

src/help.c

@@ -161,7 +161,6 @@ void do_help(void)
 	didfind = 0;
 
 	bottombars(MHELP);
-	wnoutrefresh(bottomwin);
 
 	/* Extract the title from the head of the help text. */
 	length = break_line(help_text, MAX_BUF_SIZE, TRUE);