[Bug 53888] vbscript does not allow Mid on non VT_BSTR

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=53888

Nikolay Sivov  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #1 from Nikolay Sivov  ---
Thanks, confirming. I sent some fixes
https://gitlab.winehq.org/wine/wine/-/merge_requests/1288.

As a note to myself, or anyone to clean this up further - we could either add
another helper that returns original string or allocated one after conversion,
or convert unconditionally all the time. We have instances of both now.