[INTERNAL] sap.m.MultiComboBox: Fix tests for IE
[INTERNAL] sap.m.MultiComboBox: Fix tests for IE

* IE opens a prompt dialog when qunit tests wants to access clipboard
* Disabling these tests because the dialog prevents further tests
execution

Change-Id: I8d32ce301a708dff4d729499324180078ba84d65

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