Launch hidden application when single tapped

[rondao]

What is it?

• [X] Feature

Description of the changes in your PR

At the "Manage hidden icons" section, single tapping an application will now launch it. Without this change, nothing would happen when single tapping.

Fixes the following issue(s)

• Fixes https://github.com/FossifyOrg/Launcher/issues/42

Acknowledgement

• [X] I read the contribution guidelines.

I also read the part that if the Issue have the needs triage label then the PR is less likely to get merged. But I found this feature useful and the Issue had a few thumbs up, so it looks like other people are also interested.