[INTERNAL] sap.m.MenuButton: Test page adjusted
[INTERNAL] sap.m.MenuButton: Test page adjusted

The label for the icon-only MenuButton in split mode
was actually referencing the previous standard MenuButton
in split mode - probably a mistake while copying.

Change-Id: I1c1566a2768c41aefadfe258ad007e8c5ca0b69d

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