ScenePlayer page loads selector data too early

[cj12312021]

Describe the bug When navigating to the ScenePlayer page, all the selector data gets loaded as a part of the page initialization process. For users with a large number of performers in their database, this yields noticeable hanging when interacting with the video player as that data gets loaded, see https://discord.com/channels/559159668438728723/559159910550732809/1045196529012576286 for an example.

Expected behavior Before the recent changes made to this page, I believe that data was previously loaded only when interacting with the source selector on the edit tab. Ideally, the code should revert back to that behavior.

Stash Version: (from Settings -> About): v0.17.2-61-g03cd9529