Fix abspos test: do not account for vertical-align
Fix abspos test: do not account for vertical-align

andrewleech/WeasyPrint,prepare/TestWeasyPrint,Kozea/WeasyPrint,jasco/WeasyPrint,prepare/TestWeasyPrint,marclaporte/WeasyPrint,andrewleech/WeasyPrint,jasco/WeasyPrint,Kozea/WeasyPrint,marclaporte/WeasyPrint