[Addons: Backgrounds] - Duplicating default color block

[CodeByAlex]

Describe the bug
The default color block in the backgrounds tab is being duplicated on every switch of a tab and when the default block is clicked

To Reproduce
Steps to reproduce the behavior:

1. Set up project
2. Apply the background addon globally in the addonjs and configjs
   (May be a backward compatibility issue)

addDecorator(withBackgrounds([
  { name: 'twitter', value: '#00aced' },
  { name: 'facebook', value: '#3b5998' },
]));

The following way of adding backgrounds does not work in angular

addParameters({
  backgrounds: [
    { name: 'twitter', value: '#00aced'},
    { name: 'facebook', value: '#3b5998' },
  ],
});

3. Go to the background tab and click on the default block

Expected behavior
One default block should appear rather than many

Screenshots

System:

• Framework: [Angular]
• Version: [5.0.0-rc.6]

[CodeByAlex]

@shilman , Also What is this:

Is that supposed to show up in the toolbar when using backgrounds?

[CodeByAlex]

This issue has been resolved and I am now seeing the expected result with higher versions.