Show edit window and buttons below changes when using PageForms for chameleon version 4.4.x

[WouterRademaker]

Should solve #319.
@ckapop found the issue that was causing this error and a solution. The changes were made suitable for and tested on Chameleon 4.4.1 by @WouterRademaker.

Same changes as #406

[malberts]

@WouterRademaker the failing tests suggest the new getHtml() is not getting mocked correctly. So this is a problem with this PR, not due to unrelated CI failures.

[WouterRademaker]

@malberts, but does this PR provide inspiration on how to solve this issue?

[WouterRademaker]

@malberts, how do we get the new getHtml() mocked correctly? (If that is the right term)

[malberts]

@WouterRademaker I had a quick look at the code and this does not seem like the right approach.

The Component base class is supposed to get a ChameleonTemplate injected via constructor, and also has a getSkinTemplate() method for accessing it. However, in this PR there are no changes to how it is accessed, or even any other logic changes. It only replaces the existing instance of that ChameleonTemplate. If that fixes the problem, then it suggests there is something wrong with how that initial instance is created. The solution would require fixing that, not passing around a new instance and then replacing the existing instance after the component was already created.