richedit: Added DestroyWindow call to clean up the end of a test.

[Dylan Smith]

All of the other richedit functions cleanup the tests by destroying the
window they were testing with, so I added this call to the one test that
neglected to do this.
---
 dlls/riched20/tests/editor.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
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