Fix wrong parameter fieldIndex caused IndexOutOfBoundsException

The inline authentication change ag/10235929 changes the parameter of
createInlineSuggestion from fieldIndex to datasetIndex. However, the
passed parameter forget to change to datasetIndex. It is possible to
trigger IndexOutOfBoundsException when we have multiple fields but
only one dataset.

Bug: 149891961
Test: atest android.autofillservice.cts.inline.InlineAuthenticationTest
Test: Manual test by local sample
Change-Id: Iec074b14f2aa3fdb7de918ad684192921b9c5d65