Add support directory path to JNI isolate configuration

lib/jni_isolate.dart

@@ -39,6 +39,7 @@ class JniIsolate {
       'mainIsolateSendPort': mainIsolateReceiverPort.sendPort,
       'dylibDir': dyLibDir,
       'classPath': classPath,
+      'supportDirectoryPath': _supportDirectoryPath,
     }, debugName: 'Aniyomi-JNI-Isolate');
     final message = await readyPort.first;
     readyPort.close();
@@ -57,10 +58,15 @@ class JniIsolate {
     final SendPort mainIsolateSendPort = parameters['mainIsolateSendPort'];
     final String dylibDir = parameters['dylibDir'];
     final List<String> classPath = parameters['classPath'];
+    final String supportDirectoryPath = parameters['supportDirectoryPath'];
 
     try {
       debugPrint('[JNI Isolate] Spawning JVM...');
-      Jni.spawnIfNotExists(dylibDir: dylibDir, classPath: classPath);
+      Jni.spawnIfNotExists(
+        dylibDir: dylibDir,
+        classPath: classPath,
+        jvmOptions: ['-Djava.util.prefs.userRoot=$supportDirectoryPath'],
+      );
       debugPrint('[JNI Isolate] JVM spawned. Running init...');
       JAniyomiBridge.init();
       debugPrint('[JNI Isolate] Init complete. Creating bridge instance...');