Fix compilation error with non-toolkit scrollbar.

* src/xterm.c (x_scroll_bar_expose): Fix reference to foreground pixel.

git-archimport-id: lorentey@elte.hu--2004/emacs--multi-tty--0--patch-604

src/xterm.c

@@ -5308,7 +5308,7 @@ x_scroll_bar_expose (bar, event)
    /* Restore the foreground color of the GC if we changed it above.  */
    if (f->output_data.x->scroll_bar_foreground_pixel != -1)
      XSetForeground (FRAME_X_DISPLAY (f), gc,
- 		    f->output_data.x->foreground_pixel);
+		     FRAME_FOREGROUND_PIXEL (f));
 
    UNBLOCK_INPUT;