frontend: Use auto release weak source for media controls

[cg2121]

Description

The media controls were made before auto releasing objects were implemented.

Motivation and Context

Code consistency

How Has This Been Tested?

Used media controls

Types of changes

• Tweak (non-breaking change to improve existing functionality)

Checklist:

• I have read the contributing document.
• My code has been run through clang-format.
• My code follows the project's style guidelines
• My code is not on the master branch.
• My code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.