Removed an unneeded import

app/src/test/java/org/thoughtcrime/securesms/conversation/v2/ConversationViewModelTest.kt

@@ -17,7 +17,6 @@ import org.mockito.Mockito.verify
 import org.mockito.kotlin.any
 import org.mockito.kotlin.mock
 import org.mockito.kotlin.whenever
-import org.mockito.verification.VerificationMode
 import org.session.libsession.utilities.recipients.Recipient
 import org.thoughtcrime.securesms.BaseViewModelTest
 import org.thoughtcrime.securesms.database.Storage