[FIX] sap.m.LightBox: Resize handler is now correctly detached
[FIX] sap.m.LightBox: Resize handler is now correctly detached

Change-Id: I7ffbbd86f5c05bc85fdfb5dff7c30428e49d22f1
BCP: 1780489070
Fixes https://github.com/SAP/openui5/pull/1815

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