Use "standard" shadowing in the `Font.spaceWidth` method
Use "standard" shadowing in the `Font.spaceWidth` method

With `Font.exportData` now only exporting white-listed properties, there should no longer be any reason to not use standard shadowing in the `Font.spaceWidth` method.
Furthermore, considering the amount of other changes to the code-base over the years it's not even clear to me that the special-case was necessary any more (regardless of the preceding patches).

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