Couple of fixes and improvement

The recent code change to handle player resizing via Javascript instead of CSS was causing the player to show up on top of pages when the browser width was too small.
A core method required for the new Material layout was causing it to break and detection of said layout was not as accurate as intended, this should now be fixed.
An improvement has been made to the YT+ reset option, it now prompts for reset confirmation to prevent the unintended result when users clicked on it by mistake.