[FIX] sap.m.SinglePlanningCalendar: sample is now improved
[FIX] sap.m.SinglePlanningCalendar: sample is now improved

The sap.m.Select instance in the control header section
now has a sap.m.Label instance associated with it.

BCP: 2170266530
Change-Id: Ibaeb6644bcd9cf6e27f7cbb1d3dd726b68bd4634

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