Finally fix the tests

We now dependency inject the database for the whole exercise provider,
this makes our lives a bit easier

lib/database/ingredients/ingredients_database.dart

@@ -20,6 +20,9 @@ class Ingredients extends Table {
 class IngredientDatabase extends _$IngredientDatabase {
   IngredientDatabase() : super(_openConnection());
 
+  // Named constructor for creating in-memory database
+  IngredientDatabase.inMemory(super.e);
+
   @override
   // TODO: implement schemaVersion
   int get schemaVersion => 1;