[FIX] sap.m.MultiComboBox: compact-mode fix
[FIX] sap.m.MultiComboBox: compact-mode fix

When in compact mode a style was missing.
Became obvious after a fix in Popover.

Change-Id: Iba9e815f613aef94e32cdc63a4775af06e21874e
BCP: 1780293238

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