widl: Fix write_string_tfs for strings declared as arrays.

[Robert Shearman]

The immediate type will be FC_*ARRAY, so rtype needs to use the referred 
type to get the base type.

Also update the typeformat-string offset of the type.
---
  tools/widl/typegen.c |    6 ++++--
  1 files changed, 4 insertions(+), 2 deletions(-)
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