DirectWrite: Fix vertical alignment when 'linespace' is not 0

[k-takata]

After 8.1.1009 (#4116), the vertical alignment of DirectWrite became slightly
different from GDI. This is because he DirectWrite code didn't take 'linespace' into
account. This fixes the alignment when 'linespace' is not 0.

[codecov-io]

Codecov Report

Merging #4137 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4137      +/-   ##
==========================================
- Coverage   79.23%    79.2%   -0.04%     
==========================================
  Files         105      105              
  Lines      141180   141180              
==========================================
- Hits       111870   111826      -44     
- Misses      29310    29354      +44

Impacted Files	Coverage Δ
src/gui_beval.c	55.02% <0%> (-7.43%)	⬇️
src/window.c	82.95% <0%> (-0.64%)	⬇️
src/message.c	76.45% <0%> (-0.25%)	⬇️
src/gui_gtk_x11.c	48.18% <0%> (-0.2%)	⬇️
src/gui.c	57.94% <0%> (-0.16%)	⬇️
src/term.c	60.37% <0%> (-0.16%)	⬇️
src/undo.c	83.22% <0%> (-0.07%)	⬇️
src/screen.c	80.32% <0%> (-0.03%)	⬇️
src/channel.c	83.43% <0%> (+0.07%)	⬆️
src/ex_cmds2.c	84.98% <0%> (+0.09%)	⬆️
... and 2 more

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