Fix playback toggle on dock/undock

[FigmentBoy]

Resolves: #15302

Allows the playback toggle to persist after undocking/docking the playback toolbar

• [x] I signed the CLA
• [x] The title of the PR describes the problem it addresses
• [x] Each commit's message describes its purpose and effects, and references the issue it resolves
• [x] If changes are extensive, there is a sequence of easily reviewable commits
• [x] The code in the PR follows the coding rules
• [x] There are no unnecessary changes
• [x] The code compiles and runs on my machine, preferably after each commit individually
• [x] I created a unit test or vtest to verify the changes I made (if applicable)

[FigmentBoy]

Sorry for force-pushing, I have no clue how to amend a commit without doing such, and I didn't want to make more commits than were necessary

[cbjeukendrup]

@FigmentBoy Force-pushing to your own PR branch is perfectly fine! Possibly even the best way.

[FigmentBoy]

@cbjeukendrup Thank you for letting me know. I'm a little bit new to open-source contributions so I am not too sure of the best practices.

[Eism]

@FigmentBoy Thanks for fixing it! it would be great if you could squash the commits into one.

[DmitryArefiev]

Tested #15302 on Win10, Mac12, LinuxMint 22.04 - FIXED

[FigmentBoy]

@FigmentBoy Thanks for fixing it! it would be great if you could squash the commits into one.

There you go! Unintentionally synced my fork at some point so I just removed the merge commit.