Fix sync client and sync realm tests (#1798)

Author: rorbech

packages/test-sync/src/commonTest/kotlin/io/realm/kotlin/test/mongodb/common/SyncClientTests.kt

@@ -8,7 +8,7 @@ import io.realm.kotlin.mongodb.sync.SyncConfiguration
 import io.realm.kotlin.test.mongodb.TestApp
 import io.realm.kotlin.test.mongodb.asTestApp
 import io.realm.kotlin.test.mongodb.createUserAndLogIn
-import io.realm.kotlin.test.mongodb.util.DefaultPartitionBasedAppInitializer
+import io.realm.kotlin.test.mongodb.util.DefaultFlexibleSyncAppInitializer
 import io.realm.kotlin.test.util.TestHelper
 import io.realm.kotlin.test.util.use
 import kotlin.test.AfterTest
@@ -29,7 +29,7 @@ class SyncClientTests {
 
     @BeforeTest
     fun setup() {
-        app = TestApp(this::class.simpleName, DefaultPartitionBasedAppInitializer)
+        app = TestApp(this::class.simpleName, DefaultFlexibleSyncAppInitializer)
         val (email, password) = TestHelper.randomEmail() to "password1234"
         user = runBlocking {
             app.createUserAndLogIn(email, password)