Inline the 'scalechanging' event dispatching in `BaseViewer._setScaleUpdatePages`
Inline the 'scalechanging' event dispatching in `BaseViewer._setScaleUpdatePages`

With only *one* event now being dispatched when the scale changes, in combination with there only being two call-sites, it doesn't seem necessary to keep the helper method for dispatching the 'scalechanging' event.

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