[INTERNAL][FIX] master-detail: fixed namespace of the ListSelector.js
[INTERNAL][FIX] master-detail: fixed namespace of the ListSelector.js

To match the template code, change the namespace in line 7 and 14 from
sap.ui.demo.masterdetail.model.ListSelector to
sap.ui.demo.masterdetail.demoapp.controller.ListSelector

SAP/openui5-masterdetail-app,SAP/openui5-masterdetail-app