ImmNotifyIMM with CPS_CANCEL fully clears the composition string. Also enable respective tests

[Aric Stewart]

---
  dlls/imm32/imm.c         |   11 +++++++----
  dlls/imm32/tests/imm32.c |    4 ----
  2 files changed, 7 insertions(+), 8 deletions(-)
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