rename data provider file names

src/pages/repetitions.rs

@@ -2,8 +2,8 @@ use crate::app::AppState;
 use crate::core::srs::{AppendMode, OrderMode};
 use crate::data::Id;
 use crate::data::entities::{CardStatistics, DeckSettings};
-use crate::data_provider::card_sets::update_deck;
-use crate::data_provider::card_stats::{add_stat_list, load_stats_of_deck};
+use crate::data_provider::decks::update_deck;
+use crate::data_provider::card_states::{add_stat_list, load_stats_of_deck};
 use crate::navigation::Page::{History, PreviousPage, Repetition, RepetitionSettings};
 use crate::navigation::{NavigatedPage, Page, RootMessage};
 use crate::notification::{MaybeError, NotificationRequest};