Application: Set volume after opening file

[popcornmix]

Initial volume was broken in omxplayer after #13301

Description

Set volume/mute after player is opened.

Motivation and Context

See: https://forum.kodi.tv/showthread.php?tid=298461&pid=2690445#pid2690445

How Has This Been Tested?

Positive reports in Milhouse nightly builds

Screenshots (if appropriate):

Types of change

• Bug fix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the Code guidelines of this project
• My change requires a change to the documentation, either Doxygen or wiki
• I have updated the documentation accordingly
• I have read the CONTRIBUTING document
• I have added tests to cover my change
• All new and existing tests passed

[popcornmix]

jenkins build this please
Ping @FernetMenta

[FernetMenta]

thanks for fixing it