winecoreaudio.drv: Remove some unnecessary text conversions by using snprintfW instead of snprintf.

[Rob Shearman]

Change the remaining text conversions to use the Unix CP as the
strings come from system library functions.
---
 dlls/winecoreaudio.drv/audio.c |   28 ++++++++++++++++------------
 1 files changed, 16 insertions(+), 12 deletions(-)
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