data: Fix the okr characters

This was mentioned by Wan Leung on the HKLUG mailing list:
https://groups.google.com/d/msg/hklug/6z8UW5AkvA0/i0HfV5mf80wJ

@wanleung, can you confirm this is correct?

To summarize what this change does:
- right now, we have okr/xokr as 知 佑 for both Cangjie 3 and Cangjie 5
- with this change, okr/xokr is 佑 知 for Cangjie 3 and 知 佑 for Cangjie 5

Did I get this right? :smiley: