Fix underline cursor height calculation
Fix underline cursor height calculation

Use the cell width, not the whole cursor width when calculating the
underline cursor height.

gloob/vte-copy,asivokon/vte-fx,saitoha/vte-sixel,thestinger/vte-ng,asivokon/vte-fx,thestinger/vte-ng,saitoha/vte-sixel,thestinger/vte-ng,rvu95/vte,flaxandteal/gasket-vte,gloob/vte-copy,rvu95/vte,flaxandteal/gasket-vte,aligo/vte,flaxandteal/gasket-vte,jessevdk/vte,aligo/vte,asivokon/vte-fx,flaxandteal/gasket-vte,gloob/vte-copy,pjm0616/vte,jessevdk/vte,aligo/vte,asivokon/vte-fx,jessevdk/vte,rvu95/vte,jessevdk/vte,saitoha/vte-sixel,pjm0616/vte,pjm0616/vte,rvu95/vte