user32: Handle GetTextMetricsW failure in get_text_metr_size

[Roy Shea]

Initializes the tmHeight field of the TEXTMETRICW used by callers of
get_text_metr_size, even when calls to GetTextMetricsW fail.  This fix
remedies the Valgrind errors of the form "normalize_nonclientmetrics
(sysparams.c:1043)" found throughout the advpack test suite.
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