[INTERNAL] sap.m.ComboBox: fix unit test failure (no animation on IE9)
[INTERNAL] sap.m.ComboBox: fix unit test failure (no animation on IE9)

Change-Id: Ic23a0db6220756dfed73b0f620a98d04006525d5

olirogers/openui5,SAP/openui5,nzamani/openui5,cschuff/openui5,SQCLabs/openui5,SAP/openui5,cschuff/openui5,nzamani/openui5,olirogers/openui5,SQCLabs/openui5,SAP/openui5,SAP/openui5,nzamani/openui5,SQCLabs/openui5,cschuff/openui5,olirogers/openui5