Fix how curveTo2 (v operator) is translated to SVG
Fix how curveTo2 (v operator) is translated to SVG

Based on the PDF spec, with `v` operator, current point should be used as the first control point of the curve.

Do not overwrite current point before an SVG curve is built, so it can b actually used as first control point.

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