fix(UI): Fix spinner display
fix(UI): Fix spinner display

'stroke-dasharray' and 'stroke-dashoffset' are not supported in IE11,
and we deleted those styles for spinner by accident in PR #3309.
Adding them back to fix the Spinner display.

Change-Id: I5127b1d05d25b9869b7e29f9daf8ce1c6f9b55f2

shaka-project/shaka-player,shaka-project/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,tvoli/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,tvoli/shaka-player