Wrap is_sync_running from pEpLibAdapter

src/foundation/pEp/jniadapter/AbstractEngine.java

@@ -45,6 +45,7 @@ abstract class AbstractEngine implements AutoCloseable {
 
     public native void startSync();
     public native void stopSync();
+    public native boolean isSyncRunning();
 
     public static byte[] toUTF8(String str) {
         if (str == null)

src/foundation_pEp_jniadapter_AbstractEngine.cc

@@ -343,7 +343,7 @@ extern "C" {
     JNIEXPORT jboolean JNICALL Java_foundation_pEp_jniadapter_AbstractEngine_isSyncRunning
         (JNIEnv *, jobject)
     {
-        return (jboolean) is_sync_thread(session());
+        return (jboolean) is_sync_running();
     }
 
 } // extern "C"