Remove the `PDFJS.disableHistory` code from `src/shared/compatibility.js`
Remove the `PDFJS.disableHistory` code from `src/shared/compatibility.js`

This compatibility code is only relevant for browsers that will no longer be supported (with PDF.js version 2.0), hence we ought to be able to remove it.

mainegreen/pdf.js,mozilla/pdf.js,mukulmishra18/pdf.js,nawawi/pdf.js,caremerge/pdf.js,macroplant/pdf.js,timvandermeij/pdf.js,mozilla/pdf.js,Shoobx/pdf.js,Rob--W/pdf.js,showpad/mozilla-pdf.js,mainegreen/pdf.js,adlerweb/pdf.js-Touch,macroplant/pdf.js,xavier114fch/pdf.js,Snuffleupagus/pdf.js,xavier114fch/pdf.js,nawawi/pdf.js,showpad/mozilla-pdf.js,Shoobx/pdf.js,timvandermeij/pdf.js,caremerge/pdf.js,Snuffleupagus/pdf.js,Rob--W/pdf.js,nawawi/pdf.js,timvandermeij/pdf.js,Snuffleupagus/pdf.js,Shoobx/pdf.js,adlerweb/pdf.js-Touch,showpad/mozilla-pdf.js,macroplant/pdf.js,mozilla/pdf.js,mukulmishra18/pdf.js