ntdll: rtlstr.c: Implement checking for control characters in RtlIsTextUnicode [try 4]

[Zac Brown]

Implement setting of IS_TEXT_UNICODE_CONTROLS and 
IS_TEXT_UNICODE_REVERSE_CONTROLS when control characters are present in 
RtlIsTextUnicode.

Changes from previous versions:
- This version (hopefully the last) fixes flawed logic in the switch statements. 
- Because these tests are mutually exclusive, a single goto label suffices for 
breaking the loop.

-Zac Brown
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