[FIX] sap.m.FlexBox: removeItem doesn't erroneously remove its parent if the item is a FlexBox itself
[FIX] sap.m.FlexBox: removeItem doesn't erroneously remove its parent
if the item is a FlexBox itself

BCP: 1670050356
Change-Id: I9595fc666d883470b25c82bf31911d1f09c7bdb0

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