QmlJSEditor: Use for .qmltypes

Make sure that the QML editor is used for .qmltypes files.

Change-Id: Ib9c8e497160ec9dc63eebd56485388c4b97635de
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>

src/plugins/qmljseditor/QmlJSEditor.mimetypes.xml

@@ -6,6 +6,7 @@
         <comment>QML file</comment>
         <glob pattern="*.qml"/>
         <glob pattern="*.qmlproject"/>
+        <glob pattern="*.qmltypes"/>
         <glob pattern="*.qbs"/>
         <glob pattern="*.qbp"/>
     </mime-type>