richedit: Added some extra tests for EM_FORMATRANGE.

[Dylan Smith]

The existing tests were not properly testing the return value for the case
where all the text fits in the page rect, so this patch adds a couple of
simple tests for this case.
---
 dlls/riched20/tests/editor.c |   22 +++++++++++++++++++---
 1 files changed, 19 insertions(+), 3 deletions(-)
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