mciwave: Fix copy&paste errors and remove superfluous log.

[Joerg-Cyril.Hoehle at t-systems.com]

Hi,

- shareable is neither supported nor implemented by waveaudio (other MCIxyz support it);
  Let mciOpen supply the same error code as MS-Windows.
- volatile dwPosition is recommended as the recorder thread callback updates it
  (sometimes I think the whole structure should be declared volatile).
- WARN after ExitThread is superfluous (and not present in most other code)
  -- should be ERR if at all.
- TRACE of wave format parameters is a duplicate and already logged a few lines earlier.
- TRUE (1) is not a valid return code in MMSYSTEM.
- INPUT/OUTPUTUNSPECIFIED is a typical example of copy&paste error.

Later I'll fix the same in the other MCIxyz libraries (mcicda, mcimidi and mciwave are very similar, mciavi is different). I plan to patch the former 3 only.

Regards,
	Jörg Höhle
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