Fix font-drawing in CGUIButton to use EGDF_BUTTON again (thx @DJLinux for reporting).

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4158 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CGUIButton.cpp

@@ -359,7 +359,7 @@ IGUIFont* CGUIButton::getActiveFont() const
 		return OverrideFont;
 	IGUISkin* skin = Environment->getSkin();
 	if (skin)
-		return skin->getFont();
+		return skin->getFont(EGDF_BUTTON);
 	return 0;
 }