QmlDesigner: Add QEasingCurve to value types

Without this the dot properties belonging to
QEasingCurve are not known and e.g. easing.bezierCurve
is unknown/ignored.

Change-Id: I8c6e30560a7f7b8135f1decee4065c99e43d87fc
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
(cherry picked from commit 30db773402)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/plugins/qmldesigner/libs/designercore/metainfo/nodemetainfo.cpp

@@ -345,7 +345,8 @@ inline static bool isValueType(const TypeName &type)
                                                     "vector3d",
                                                     "vector4d",
                                                     "font",
-                                                    "QQuickIcon"});
+                                                    "QQuickIcon"
+                                                    "QEasingCurve"});
     return objectValuesList.contains(type);
 }
 
@@ -365,7 +366,8 @@ inline static bool isValueType(const QString &type)
                                                "vector3d",
                                                "vector4d",
                                                "font",
-                                               "QQuickIcon"});
+                                               "QQuickIcon",
+                                               "QEasingCurve"});
     return objectValuesList.contains(type);
 }