dict files lost when updating plugin

[jjw24]

originally from jjw24/WoxDictionary#5

Due to the files not being kept in UserData location.

Suggestion:
Store dict files in UserDataLocation\Settings\Plugins\Flow.Launcher.Dictionary

[harrynull]

I am working on a feature where it can download the database and store it to %LocalAppData%\Flow.Dictionary\ecdict.db if needed. I feel weird putting it under Settings and the file seems to be too large to roam. Let me know if you think otherwise.