Bring back the "Disabled Add-ons Only" filter in Preferences > Addons

This patch added a "Enabled Add-ons only" radio button, and removed the "Enabled" and "Disabled" filters that were located in the "Category" drop-down menu (in Preferences > Addons).

While this is a nice improvement (to be able to quickly limit entries to enabled add-ons only), this patch also introduced a regression. 😟

Since this patch, it has become impossible to see "Disabled Add-ons Only" anymore, which was a interesting option to find a particular add-on in a long list of add-ons. Now, you have to search for it in a list of Enabled Add-ons and Disabled Add-ons.

I hope that developers will consider removing this radio button and replace it with a new drop-down menu that would contain:

• "Enabled Add-ons Only"
• "Disabled Add-ons Only"
• "All Add-ons"

This drop-down menu wouldn't take more space than the recently added checkbox (I measured it) and would give users back the option to display "Disabled Add-ons", just as before.

PS: also, on a side note, could the label "All" in the dropdown menu for categories be renamed to "All categories" ? In order to be clearer.. (because reading "All" at first sight, the user could wonder what this "All" is for..)