mapwidget.h: force-undefine the IGNORE macro from winbase.h

By including <QQuickWidget>, <winbase.h> is included from <windows.h>.
<winabase.h> has the IGNORE macro defined.

Undefine it localy in mapwidget.h to prevent a conflict with maintah.h's
EditMode::IGNORE enum.

NOTE: possibly similar case to the undefine in
btdeviceselectiondialog.h:22.

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>

desktop-widgets/mapwidget.h

@@ -3,6 +3,8 @@
 
 #include <QQuickWidget>
 
+#undef IGNORE
+
 class QResizeEvent;
 class QQuickItem;
 struct dive_site;