Fix font-string variable name typo
Fix font-string variable name typo

The font-string rebuild condition is always satisfied because the concerned variables are never set.
nawawi/pdf.js,caremerge/pdf.js,mozilla/pdf.js,Snuffleupagus/pdf.js,macroplant/pdf.js,showpad/mozilla-pdf.js,Shoobx/pdf.js,xavier114fch/pdf.js,mozilla/pdf.js,caremerge/pdf.js,nawawi/pdf.js,Shoobx/pdf.js,showpad/mozilla-pdf.js,Shoobx/pdf.js,macroplant/pdf.js,timvandermeij/pdf.js,mainegreen/pdf.js,Snuffleupagus/pdf.js,mukulmishra18/pdf.js,mozilla/pdf.js,nawawi/pdf.js,xavier114fch/pdf.js,mukulmishra18/pdf.js,mainegreen/pdf.js,Snuffleupagus/pdf.js,macroplant/pdf.js,timvandermeij/pdf.js,timvandermeij/pdf.js,showpad/mozilla-pdf.js