ntdll: rtlstr.c: Remove byte reversed U+3000 (CJK space) from being checked in RtlIsTextUnicode

[Zac Brown]

Remove byte reversed U+3000 (CJK space) from being checked in RtlIsTextUnicode.

This patch addresses the regression reported in bug 14539 
(http://bugs.winehq.org/show_bug.cgi?id=14539).

Tests still pass on Wine.
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