fix(tui): dedupe was removing history (#1610)

Related: https://forum.atuin.sh/t/search-ignoring-commands/74/5?u=ellie

When a user ran a duplicated command, but in another session, it was
removed by filters. This is because the subquery that was once used did
not have the same filters applied as the main query.

Instead of messing with subqueries, `group by` instead. This aligns with
the search() function

atuin-client/src/database.rs

@@ -306,10 +306,7 @@ impl Database for Sqlite {
         }
 
         if unique {
-            query.and_where_eq(
-                "timestamp",
-                "(select max(timestamp) from history where h.command = history.command)",
-            );
+            query.group_by("command").having("max(timestamp)");
         }
 
         if let Some(max) = max {