Left-align wxSpinCtrl contents by default

The default alignment of the text in wxSpinCtrl was changed to "right"
in 7e4952db83, which added alignment
support (see #10621), but this made it inconsistent with the native
up-down control under MSW and, perhaps more importantly, with spin
controls created from XRC as the default style was never modified there
and did not include wxALIGN_RIGHT.

Resolve this inconsistency by reverting to left-aligning the text by
default.

include/wx/msw/spinctrl.h

@@ -36,7 +36,7 @@ public:
                const wxString& value = wxEmptyString,
                const wxPoint& pos = wxDefaultPosition,
                const wxSize& size = wxDefaultSize,
-               long style = wxSP_ARROW_KEYS | wxALIGN_RIGHT,
+               long style = wxSP_ARROW_KEYS,
                int min = 0, int max = 100, int initial = 0,
                const wxString& name = wxT("wxSpinCtrl"))
     {
@@ -50,7 +50,7 @@ public:
                 const wxString& value = wxEmptyString,
                 const wxPoint& pos = wxDefaultPosition,
                 const wxSize& size = wxDefaultSize,
-                long style = wxSP_ARROW_KEYS | wxALIGN_RIGHT,
+                long style = wxSP_ARROW_KEYS,
                 int min = 0, int max = 100, int initial = 0,
                 const wxString& name = wxT("wxSpinCtrl"));