[INTERNAL][FIX] sap.m.Table: Fixing the column header height in Compact mode.
[INTERNAL][FIX] sap.m.Table: Fixing the column header height in Compact
mode.

Correcting the header row height to 2rem.
Adding border-bottom to the column header.

Change-Id: I35b0cefef61aabbcdfea589482b64442ae72f919

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