Remove unnecessary processing for retrieving the value of the auto-increment column (#1193)

This fix is related to #1191.

Author: nakamura-to

doma-core/src/main/java/org/seasar/doma/jdbc/query/AutoInsertQuery.java

@@ -190,7 +190,7 @@ private void assembleUpsertSql(PreparedSqlBuilder builder, Naming naming, Dialec
 
   @Override
   public void generateId(Statement statement) {
-    if (generatedIdPropertyType != null && idGenerationConfig != null) {
+    if (isAutoGeneratedKeysSupported()) {
       entity =
           generatedIdPropertyType
               .postInsert(

doma-core/src/main/java/org/seasar/doma/jdbc/query/AutoMultiInsertQuery.java

@@ -200,7 +200,7 @@ private void assembleUpsertSql(PreparedSqlBuilder builder, Naming naming, Dialec
 
   @Override
   public void generateId(Statement statement) {
-    if (generatedIdPropertyType != null && idGenerationConfig != null) {
+    if (isAutoGeneratedKeysSupported()) {
       List<ENTITY> newEntities =
           generatedIdPropertyType.postInsert(entityType, entities, idGenerationConfig, statement);
       if (entities.size() == newEntities.size()) {