Convert examples/image_decoders/jpeg_viewer.js to await/async #14123
Convert examples/image_decoders/jpeg_viewer.js to await/async #14123

showpad/mozilla-pdf.js,mozilla/pdf.js,Snuffleupagus/pdf.js,nawawi/pdf.js,showpad/mozilla-pdf.js,nawawi/pdf.js,macroplant/pdf.js,timvandermeij/pdf.js,macroplant/pdf.js,Shoobx/pdf.js,Snuffleupagus/pdf.js,Snuffleupagus/pdf.js,timvandermeij/pdf.js,macroplant/pdf.js,Shoobx/pdf.js,Shoobx/pdf.js,mozilla/pdf.js,mozilla/pdf.js,timvandermeij/pdf.js,showpad/mozilla-pdf.js,nawawi/pdf.js