Fix the ordering of Cangjie 5 codes

Some characters have multiple Cangjie 5 codes. For any such character, the codes we have are ordered alphabetically. This comes from the original data we got when we started working on this with Wan Leung; the whole data was indexed by code, alphabetically:

https://github.com/wanleung/libcangjie/blob/master/tables/cj5-cjk.txt

However, we are about to split multiple codes for any given character so that only the first one has the non-zero frequency, and all additional codes have a frequency of 0. (see #104 (closed))

A prerequisite to that is that the multiple codes are actually ordered correctly.

For Cangjie 5, we should be able to do it by comparing with the results at http://www.chinesecj.com/cj5dict/ .