widl: Use is_string_type instead of is_attr(..., ATTR_STRING) for detecting strings.

[Rob Shearman]

Detecting strings is a bit harder than just looking for the string
attribute, so make sure to use the function which has the purpose of
doing just that.

Fixes compilation of generated server/proxy code when a parameter has
both the [out] and [string] attributes.
---
 tools/widl/typegen.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
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