[INTERNAL] sap.f.GridContainer: Fix unstable Safari and Firefox
[INTERNAL] sap.f.GridContainer: Fix unstable Safari and Firefox

Change-Id: Icd0b1ca6519d353df605ea85c54dea99416f765f
BCP: 2180353376

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