QmlDesigner: Fix multimedia specifics

Fix multimedia specifics in property editor by re-adding AudioSection

Change-Id: I65bd7c371ca86b643551e8943e64fb701f54017e
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

share/qtcreator/qmldesigner/propertyEditorQmlSources/QtMultimedia/AudioSection.qml

@@ -0,0 +1,67 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+import QtQuick 2.15
+import QtQuick.Layouts 1.15
+import HelperWidgets 2.0
+import StudioControls 1.0 as StudioControls
+import StudioTheme 1.0 as StudioTheme
+
+Section {
+    caption: qsTr("Audio")
+
+    anchors.left: parent.left
+    anchors.right: parent.right
+
+    SectionLayout {
+        PropertyLabel { text: qsTr("Volume") }
+
+        SecondColumnLayout {
+            SpinBox {
+                implicitWidth: StudioTheme.Values.twoControlColumnWidth
+                               + StudioTheme.Values.actionIndicatorWidth
+                backendValue: backendValues.volume
+                decimals: 1
+                minimumValue: 0.0
+                maximumValue: 1.0
+            }
+
+            ExpandingSpacer {}
+        }
+
+        PropertyLabel { text: qsTr("Muted") }
+
+        SecondColumnLayout {
+            CheckBox {
+                implicitWidth: StudioTheme.Values.twoControlColumnWidth
+                               + StudioTheme.Values.actionIndicatorWidth
+                backendValue: backendValues.muted
+                text: backendValues.muted.valueToString
+            }
+
+            ExpandingSpacer {}
+        }
+    }
+}