kkc gives incorrect results regarding to the word 令和 about libkkc

[xuzhao9]

This is a bug caused by the frontend fcitx5-kkc, as it failed to load the SKK dictionary.

[xuzhao9]

Some further investigations:
At https://github.com/ueno/libkkc/blob/master/libkkc/context.vala#L174, the context CLEARS the all dictionaries in the context. When the user quits a program, fcitx5-kkc will deconstruct a Context, which clears the dictionary. The next time a program opens, kkc will lose all the dictionary information.

Now the question is: should kkc State keep the dictionary information even though it destructs, and let the caller handle the dictionary resource?