Default query language in app state to match linked search if there is one

[Bargs]

When creating new filters, filter_bar_click_handler looks at the app state to see which language it should use. In Visualize, when a visualization is linked to a saved search, that saved search's query is separate from the one in app state. This means that filter_bar_click_handler might use the wrong language if, for instance, the saved search is lucene but the default language (in app state) is kuery. When a saved search is linked, we should ignore the global default and set the app state language to whatever the saved search is using.

[Bargs]

No longer necessary now that #14212 is merged