[INTERNAL] sap.m.ComboBox: Update testsuite example
[INTERNAL] sap.m.ComboBox: Update testsuite example

Udpate testsuite example to a json file available in all bundles.

Change-Id: Ie81e01affcd76dae80e9d9bcef865d623c19497a

SAP/openui5,SAP/openui5,SAP/openui5,SAP/openui5