fix(linux): play sound, when initialized

[Gustl22]

Description

Sometimes sound is not played, if setting the source for the player and immediately start it (like the play method).
So now it starts playing as soon as the sound is initialized, if the user already decided to play the source (similar to Android).

Possible fix for: #1144

Checklist

• The title of my PR starts with a Conventional Commit prefix (fix:, feat:, docs:, chore: etc).
• I have read the Contributor Guide and followed the process outlined for submitting PRs.
• I have updated/added tests for ALL new/updated/fixed functionality (see tests: library tests to play multiple sources #1333).
• I have updated/added relevant documentation and added dartdoc comments with ///, where necessary.
• I have updated/added relevant examples in example.

Breaking Change

• Yes, this is a breaking change.
• No, this is not a breaking change.

Related Issues