richedit: Calculate tab positions relative to end of selection bar

[Dylan Smith]

Previously the tab positions were calculated relative to the start of
the control, which caused the first tab position seem smaller than the
rest of the tabs.  The easiest way to test this is to open wordpad and
enter characters followed by tabs.

I also replaced the number for the default tab position with the
lDefaultTab marco defined for it in the public header file (richedit.h).
---
 dlls/riched20/run.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
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