richedit: Trailing spaces should not affect alignment shift length

[Dylan Smith]

To notice the bug, open wordpad using Wine.
1. Enter text
2. Center some text
3. Add spaces at the end of the text (i.e. end of the paragraph).

These trailing spaces do not affect the position of the line they are on
in native richedit, but they did in Wine.  This patch fixes this bug to
adopt the native behaviour in this situation.
---
 dlls/riched20/wrap.c |   48 +++++++++++++++++++++++++++++++++++++-----------
 1 files changed, 37 insertions(+), 11 deletions(-)
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