[INTERNAL] Table: fix popin layout behaviour
[INTERNAL] Table: fix popin layout behaviour

Header flexbox controls with 100% width corrupted the popin layout so that the Focus outline was not
aligned/centered around control thus not all sides were visible.

BCP: 2270122109
Change-Id: I750b83373f0c9a350ddbe2709281c42d2ca246e5

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