[INTERNAL] sap.m.Input: Modify testsuite sample
[INTERNAL] sap.m.Input: Modify testsuite sample

The _getSeparateSuggestions method is no longer existent, and is replaced by a getProperty call in the test suite sample for the separateSuggestions property.

Change-Id: I4fd5ce2570771c97129c79df2623a8f53b2c609c

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