Remove algorithm.h from jsonfieldpage.h

Change-Id: I15dfae3568030c169785c33e7957ecba3e975b65
Reviewed-by: Cristian Adam <cristian.adam@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/projectexplorer/jsonwizard/jsonfieldpage.cpp

@@ -345,6 +345,13 @@ QVariant JsonFieldPage::value(const QString &key)
     return w->value(key);
 }
 
+JsonFieldPage::Field *JsonFieldPage::jsonField(const QString &name)
+{
+    return Utils::findOr(m_fields, nullptr, [&name](Field *f) {
+        return f->name() == name;
+    });
+}
+
 QWidget *JsonFieldPage::Field::widget() const
 {
     return d->m_widget;