ntdll[1/2]: add some tests for RtlIsTextUnicode

[Mikolaj Zalewski]

I thought that RtlIsUnicodeString(.., IS_TEXT_UNICODE_REVERSE_MASK)
will return TRUE if the string is big endian Unicode but it doesn't -
our implementation is correct. But tests can still be useful. They
detected a problem of detecting an ASCII string as Unicode because of
the trailing NUL - see next patch.
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