Correct fetch behaviour

src/tui/app/machine/fetch_state.rs

@@ -165,7 +165,7 @@ impl AppMachine<FetchState> {
             MbReturn::Match(next_match) => {
                 AppMachine::match_state(inner, MatchState::new(next_match, fetch)).into()
             }
-            _ => unimplemented!(),
+            MbReturn::Fetch(_) => Self::app_fetch_next(inner, fetch),
         }
     }