[2/2] ntdll: rtlstr.c: Implement checking for control characters in RtlIsTextUnicode [try 6]

[Zac Brown]

Add checking for control characters in both standard and byte-reversed forms to 
(Rtl)IsTextUnicode.

Changelog:
* Discarded ugly for-loop and switch in favor of strpbrkW per AJ's suggestion.
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