fixed creating device table

src/de/tudarmstadt/informatik/hostage/persistence/HostageDBOpenHelper.java

@@ -92,7 +92,7 @@ public class HostageDBOpenHelper extends SQLiteOpenHelper {
         // SyncDeviceEntry
 		StringBuilder syncDevicesSQLBuilder = new StringBuilder("CREATE TABLE ").append(SyncDeviceEntry.TABLE_NAME).append("(");
 		syncDevicesSQLBuilder.append(SyncDeviceEntry.COLUMN_NAME_DEVICE_ID).append(" TEXT PRIMARY KEY,");
-		syncDevicesSQLBuilder.append(SyncDeviceEntry.COLUMN_NAME_DEVICE_TIMESTAMP).append(" INTEGER");
+		syncDevicesSQLBuilder.append(SyncDeviceEntry.COLUMN_NAME_DEVICE_TIMESTAMP).append(" INTEGER,");
         syncDevicesSQLBuilder.append(SyncDeviceEntry.COLUMN_NAME_HIGHEST_ATTACK_ID).append(" INTEGER");
         syncDevicesSQLBuilder.append(")");
 		SQL_CREATE_SYNC_DEVICES_ENTRIES = syncDevicesSQLBuilder.toString();