Minor fixes to appicon highlighting

When an app hides its window but doesn't exit (e.g. apps that "minimize"
to the system tray), the highlighting was not being removed.

When alt-tabbing, the tabbed-to app's icon was not getting highlighted.

Signed-off-by: Brad Jorsch <anomie@users.sourceforge.net>

src/actions.c

@@ -211,8 +211,9 @@ void wSetFocusTo(WScreen *scr, WWindow *wwin)
 
 		if (wwin->flags.mapped)
 			wAppMenuMap(napp->menu, wwin);
-		wApplicationActivate(napp);
 	}
+	if (napp)
+		wApplicationActivate(napp);
 
 	XFlush(dpy);
 	old_scr = scr;