[LLDB] Mark TestCallStdStringFunction as XPASS on Windows (#146835)

#146562 made
[TestCallStdStringFunction](https://github.com/llvm/llvm-project/blob/bd6cd92984e7a30cb91e4f069a0bacc5c582a234/lldb/test/API/commands/expression/call-function/TestCallStdStringFunction.py)
unexpectedly pass on Windows.

The test now passes, because `expression str` now prints the "raw"
string object, which happens to include the string "Hello world".
Previously, this resulted in an error:

```
(lldb) expression str
(std::string) $0 = {
  _Mypair = {
    _Myval2 = {
      _Bx = (_Buf = "Hello world", _Ptr = "", _Alias = "Hello world")
      _Mysize = 11
      _Myres = 15
    }
  }
}
(lldb) type summary add std::string --summary-string "${var._M_dataplus._M_p}"
^^^ previous summary ^^^
(lldb) expression str
(std::string) $1 = error: summary string parsing error
```

#143177 will eventually add the correct summary for MSVC STL strings.

Relates to https://github.com/llvm/llvm-project/issues/22139

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