feat: allow player dimension method to accept 'auto'

[klee-frankly]

Description

Allow the dimension method of the Player module to accept 'auto' as an explicit value.

Specific Changes proposed

Check if dimension value in src/js/player.js's dimension function is 'auto' or '' when deciding to set the dimension to be automatic and return early in the function.

Requirements Checklist

• [*] Feature implemented / Bug fixed
• Reviewed by Two Core Contributors

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[gkatsev]

Seems reasonable to me, but this is a new feature rather than a fix.

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