Update logic in disco pane so static themes are installed similiarly to lightweight themes

Describe the problem and steps to reproduce it:

Right now, you can’t see the theme when it’s toggled on. It seems to install but be enabled

You should also be able to click the image to “toggle on”

What did you expect to happen?

If should appear to work the same way lightweight themes

Anything else we should know?

notes for dev: if you run setCurrentStatus on the change of status in componentsWillReceiveProps, you see the following with toggling on/off:

first toggle on: you see theme

first toggle off: you see theme turn off and uninstalls

2nd toggle on: it’s seems to download/install but it gets disabled. You can click the switch here and enables ** this is the issue - need to look into this more

2nd toggle off: you see theme turns off and uninstalls

[willdurand]

Let’s keep it open to make sure we address this issue as it is specific to the disco pane.

[AlexandraMoga]

Verified fixed on AMO -dev with FF61, Win10x64

• static themes can be installed by clicking on the ‘Install Theme’ button
• static themes can be installed by clicking on the preview image
• static themes can be uninstalled by clicking on the Remove button