common: finally spot the text size bug

GetBestWrappedSize (hence the BestSize) computes the size of
the wrapped text based on box side minus padding.

So the width of the widget is already the good size for text wrapping

common/src/Utilities/pxStaticText.cpp

@@ -228,7 +228,6 @@ bool pxStaticText::_updateWrapping(bool textChanged)
 
     wxString wrappedLabel;
     int newWidth = GetSize().GetWidth();
-    newWidth -= (int)(newWidth * m_paddingPct_horiz * 2) + (m_paddingPix_horiz * 2);
 
     if (!textChanged && (newWidth == m_wrappedWidth))
         return false;