Minor fixes in ActionButton widget

[georgweiss]

If user marks ActionButton as disabled and then edits the associated actions, the enabled state reverts back to "enabled" when user dismisses the actions dialog.

This PR fixes the issue.

Additionally:

• Cursor changes not applied in edit mode when widget is marked as disabled. Found it a bit confusing and not very useful to see the "not writable" cursor in while editing the OPI.
• Some dead code removed.

[georgweiss]

@kasemir, can you please add your input?

[kasemir]

I did, see earlier 'review' comment.
The empty attachTooltip() needs to remain.
If you remove it, we fall back to the default which adds a tooltip to the jfx_node, a "Pane", but we already attach a tooltip to the actual button in makeBaseButton(), so you get two tool tips.
Leave attachTooltip() {} as it was to only get the one correct tool tip on the Button.

[kasemir]

This is what I had tried to point out a few days ago, not sure if "pending" means it doesn't show up?

[georgweiss]

Precisely, cannot see the review comment.

In any case, will put back attachTooltip

[kasemir]

Look good!