[FIX] sap.m.ComboBox: Autocapitalization rendering tests are now fixed in FF
[FIX] sap.m.ComboBox: Autocapitalization rendering tests are now fixed in FF

When autocapitalize of an input is turned off Firefox gives it an
attribute value of "none" and not "off" like the other browsers.

QUnits are now fixed to check for the correct value in Firefox.

BCP: 2080404811
Change-Id: I27f64f429606c963aea4be70c6822c60d0442f9a

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