Don't add margins for buttons with text and images by default in wxMSW.

For some reason wxXPButtonImageData added (big) margins around the button by
default resulting in too much padding. Simply remove these margins to make it
behave similarly to wxODButtonImageData.

See #12924.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66891 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/button.cpp

@@ -225,13 +225,13 @@ public:
 
         m_data.himl = GetHimagelistOf(&m_iml);
 
-        // use default margins
+        // no margins by default
         m_data.margin.left =
-        m_data.margin.right = btn->GetCharWidth();
+        m_data.margin.right =
         m_data.margin.top =
-        m_data.margin.bottom = btn->GetCharHeight() / 2;
+        m_data.margin.bottom = 0;
 
-        // and default alignment
+        // use default alignment
         m_data.uAlign = BUTTON_IMAGELIST_ALIGN_LEFT;
 
         UpdateImageInfo();