Issue 198 - Fix an issue with settings in AniList provider

[hmsmart]

Pull Request to address #198.
Initial Issues Appeared to be as follows:
MangaManager/ExternalSources/MetadataSources/Providers/AniList.py on line 38:

romaji_as_series = True

This value should be dynamic and whatever settings are loaded from ini.

romaji_as_series = Settings().get(name, AniListSetting.SeriesTitleLanguage)

Additionally, I've updated the save_settings method to be a class method, since all instances should share the same settings anyway. Without doing this, settings changes in the GUI are not represented until restart when the factory remakes the AniList provider.

Finally, a change is made to properly complete all states for the setting:

true: Romaji->Series, English->LocalizedSeries
false: English->Series, Romaji->LocalizedSeries
Always Romaji->Series when no English

MangaManager/ExternalSources/MetadataSources/Providers/AniList.py on line 141:

comicinfo.series = title_english if title_english != "" else title_romaji.