Also fix without workers

Author: simolus3

packages/powersync_core/lib/src/database/web/web_powersync_database.dart

@@ -162,7 +162,7 @@ class PowerSyncDatabaseImpl
       sync = StreamingSyncImplementation(
         adapter: storage,
         credentialsCallback: connector.getCredentialsCached,
-        invalidCredentialsCallback: connector.fetchCredentials,
+        invalidCredentialsCallback: connector.prefetchCredentials,
         uploadCrud: () => connector.uploadData(this),
         crudUpdateTriggerStream: crudStream,
         retryDelay: Duration(seconds: 3),

packages/powersync_core/pubspec.yaml

@@ -13,7 +13,7 @@ dependencies:
   # but right now we need a minimum of v2.4.6.
   sqlite3: ^2.4.6
   # We implement a database controller, which is an interface of sqlite3_web.
-  sqlite3_web: ^0.3.0
+  sqlite3_web: ^0.3.1
   universal_io: ^2.0.0
   meta: ^1.0.0
   http: ^1.1.0