[INTERNAL] sap.m.LightBox: Corrected footer colour
[INTERNAL] sap.m.LightBox: Corrected footer colour

Change-Id: I8928a1367d708a5203ce7b4344c09ab34e8f7949

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