QQuickComboBox: update QRegularExpression wildcard code

Following the update of qtbase because of QTBUG-72539, the code using
wildcardToRegularExpression must be updated as anchoredPattern is not
needed anymore.

Task-number: QTBUG-72539
Change-Id: I51c895560866079c9cc27fa076e29fa4546ecf8f
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

src/quicktemplates2/qquickcombobox.cpp

@@ -594,7 +594,7 @@ int QQuickComboBoxPrivate::match(int start, const QString &text, Qt::MatchFlags
                 break;
             }
             case Qt::MatchWildcard: {
-                QRegularExpression rx(QRegularExpression::anchoredPattern(QRegularExpression::wildcardToRegularExpression(text)),
+                QRegularExpression rx(QRegularExpression::wildcardToRegularExpression(text),
                                       options);
                 if (rx.match(t).hasMatch())
                     return idx;