Add presentation role to text layer spans. (#13278)
Add presentation role to text layer spans. (#13278)

Keeps screen readers from pausing on every span so
paragraphs are read more naturally. Note: this only seems
to affect Firefox, Chrome automatically combines the spans.
timvandermeij/pdf.js,Shoobx/pdf.js,Snuffleupagus/pdf.js,nawawi/pdf.js,showpad/mozilla-pdf.js,mozilla/pdf.js,Shoobx/pdf.js,macroplant/pdf.js,showpad/mozilla-pdf.js,Snuffleupagus/pdf.js,mozilla/pdf.js,macroplant/pdf.js,xavier114fch/pdf.js,Snuffleupagus/pdf.js,nawawi/pdf.js,timvandermeij/pdf.js,Shoobx/pdf.js,xavier114fch/pdf.js,mozilla/pdf.js,nawawi/pdf.js,macroplant/pdf.js,timvandermeij/pdf.js,showpad/mozilla-pdf.js