Simplify the `_setScale` call when changing Scroll modes
Simplify the `_setScale` call when changing Scroll modes

Since the current page will be explicitly scrolled into view *directly* afterwards anyway (compare with e.g. the `pagesRotation` code), trying to maintain the current position when re-applying the zoom level during changing of Scroll modes is redundant.

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