SQL/OCI: fix QOCIDriver::formatValue()

The switch needs to be on QSqlField::metaType() instead the internal
QSqlField::typeID() which holds the db-specific type of this field.

This amends 7b391c0.

Pick-to: 6.5 6.2
Change-Id: Id1d1791826f08adb01cc3da45bf5a66bad288046
Reviewed-by: Andy Shaw <andy.shaw@qt.io>
(cherry picked from commit 55d1480)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit a1c6bb8)

src/plugins/sqldrivers/oci/qsql_oci.cpp

@@ -2684,7 +2684,7 @@ QSqlIndex QOCIDriver::primaryIndex(const QString& tablename) const
 
 QString QOCIDriver::formatValue(const QSqlField &field, bool trimStrings) const
 {
-    switch (field.typeID()) {
+    switch (field.metaType().id()) {
     case QMetaType::QDateTime: {
         QDateTime datetime = field.value().toDateTime();
         QString datestring;