Removed glassdown

[notPlancha]

Description

Removed glassdown from Untouched APKs, as the project went private.

Context

Glassdown is/was an apkmirror client, and it seems the project went private (found references to it as of 4 days ago, so it's relatively recent the change).

Types of changes

• [X] Bad / Deleted sites removal
• [ ] Grammar / Markdown fixes
• [ ] Content addition (sites, projects, tools, etc.)
• [ ] New Wiki section

Checklist:

• [X] I have read the contribution guide.
• [X] I have made sure to search before making any changes.
• [X] My code follows the code style of this project.