Reset ltr direction on control bar and spinner

[mister-ben]

Description

If the player is inheriting rtl directionality, the control bar order reverses as flex box row order follows text direction. The loading spinner animation is also broken as the circles are not aligned. This PR resets the direction on those components to ltr, allowing the rest of the player, especially dialogs with localised text to inherit rtl.

Fixes #3204

Specific Changes proposed

Adds dir="ltr" to the ControlBar and LoadingSpinner components

Requirements Checklist

• Feature implemented / Bug fixed
• If necessary, more likely in a feature request than a bug fix
  • Unit Tests updated or fixed
  • Docs/guides updated
  • Example created (starter template on JSBin)
• Reviewed by Two Core Contributors

[gkatsev]

LGTM. Thanks @mister-ben :)