Remove unnecessary calls from wxDCImpl ctor

There is no need to call neither ResetBoundingBox() nor ResetClipping()
when the variables they reset had just been initialized to the same
values in the ctor initializer list.

src/common/dcbase.cpp

@@ -353,9 +353,6 @@ wxDCImpl::wxDCImpl( wxDC *owner )
                     (double)wxGetDisplaySizeMM().GetWidth();
     m_mm_to_pix_y = (double)wxGetDisplaySize().GetHeight() /
                     (double)wxGetDisplaySizeMM().GetHeight();
-
-    ResetBoundingBox();
-    ResetClipping();
 }
 
 wxDCImpl::~wxDCImpl()