Add Motrix.app v1.1.3

[Mitscherlich]

After making all changes to the cask:

• brew cask audit --download motrix is error-free.
• brew cask style --fix motrix.rb reports no offenses.
• The commit message includes the cask’s name and version.
• The submission is for a stable version or documented exception.

Additionally, if adding a new cask:

• Named the cask according to the token reference.
• brew cask install motrix worked successfully.
• brew cask uninstall motrix worked successfully.
• Checked there are no open pull requests for the same cask.
• Checked the cask was not already refused.
• Checked the cask is submitted to the correct repo.

[reitermarkus]

Thanks!