Fix booleans not working as expected in mapFromCompanion (#559)

moor/lib/src/runtime/query_builder/schema/table_info.dart

@@ -68,9 +68,10 @@ mixin TableInfo<TableDsl extends Table, D extends DataClass> on Table
           'evaluated by a database engine.');
     }
 
+    final context = GenerationContext(SqlTypeSystem.defaultInstance, null);
     final rawValues = asColumnMap
         .cast<String, Variable>()
-        .map((key, value) => MapEntry(key, value.value));
+        .map((key, value) => MapEntry(key, value.mapToSimpleValue(context)));
 
     return map(rawValues);
   }

moor/test/tables_test.dart

@@ -39,7 +39,8 @@ void main() {
       id: Value(3),
       name: Value('hi'),
       profilePicture: Value.absent(),
-      isAwesome: Value(true),
+      // false for https://github.com/simolus3/moor/issues/559
+      isAwesome: Value(false),
     );
 
     final user = db.users.mapFromCompanion(companion);
@@ -49,7 +50,7 @@ void main() {
         id: 3,
         name: 'hi',
         profilePicture: null,
-        isAwesome: true,
+        isAwesome: false,
         creationTime: null,
       ),
     );