fix: intrinsicProportion is not a number#3043

ccheng-dev wants to merge 2 commits intoniklasvh:masterniklasvh/html2canvas:masterfrom

tine-groupware:pu/ccheng/fix_intrinsicSizetine-groupware/html2canvas:pu/ccheng/fix_intrinsicSizeCopy head branch name to clipboard