fix(demo): Fix error text overflow
fix(demo): Fix error text overflow

Some very long URLs can appear in the error text, and word wrapping is
very helpful.  This change sets styles on the element to wrap text
anywhere.

Change-Id: I9b1ddc97f90d5f1b2f5e532efd7c53f747576db5

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