[INTERNAL] sap.m.SelectList: layout of items improved
[INTERNAL] sap.m.SelectList: layout of items improved

Adding a border to an item should not increase the computed height. With
this fix, the box-sizing CSS property is set to "border-box". Now the
width and height of items include the padding and border.

Change-Id: I5e4ff72f8a7fdfd71d4cc23aab1b01a550840a36

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