[FIX] sap.uxap.AnchorBar: Fixed issue with AnchorBar mode
[FIX] sap.uxap.AnchorBar: Fixed issue with AnchorBar mode

- When ObjectPage is rerendered and is inside FlexibleColumnLayout the
AnchorBar would disappear

Change-Id: I32a4d851197e662efbbfb1b3c61b53940bcc5a76
BCP: 1780203111

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