ntdll: rtlstr.c: Implement checking for control characters in RtlIsTextUnicode [try 9]

[Zac Brown]

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

Changelog:
* Use strchrW instead of a helper function to check characters against control 
character strings.
* Properly takes length of string to check into account.
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