[INTERNAL] sap.m.ComboBox: Enable skipped QUnit tests
[INTERNAL] sap.m.ComboBox: Enable skipped QUnit tests

JIRA: BGSOFUIRILA-2646
Change-Id: I1da306848f3539473c8b4fbab554f816e0ca95cd

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