[INTERNAL] sap.m.MessageToast: Accessibility test page enhanced
[INTERNAL] sap.m.MessageToast: Accessibility test page enhanced

- Checkbox is added, in order to easily toggle
compact/cozy mode.
-  More comprehensible title is used.

JIRA: BGSOFUIRILA-2423
Change-Id: I10ad543c891b9b57ae065071d4c5547e2ae5b6af

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