Fix logic error making it impossible to uninstall multiple add-ons (#15966)
Summary of the issue:
When trying to uninstall multiple add-ons nothing was happening, and according to the log none of the selected add-ons was relevant for remove action.
Description of user facing changes
It is now possible to uninstall multiple add-ons in the Add-ons Store.
Description of development approach
The condition which was checking if the given add-on can be removed is inverted, so that the removal is possible when add-on can indeed be removed