Mark traits as "transient" instead of explicitly overriding traits __getstate__

[rahulporuri]

enable/enable/scrolled.py

Lines 614 to 619 in 6850385

	def __getstate__(self):
	state = super().__getstate__()
	for key in ["alternate_vsb", "_vsb", "_hsb"]:
	if key in state:
	del state[key]
	return state

enable/enable/abstract_window.py

Lines 555 to 560 in 588cde7

	def __getstate__(self):
	attribs = ("component", "bgcolor", "overlay", "_scroll_origin")
	state = {}
	for attrib in attribs:
	state[attrib] = getattr(self, attrib)
	return state