SparkMeet plugin should store settings in Spark folder

There is a line to store ofmeet settings:

private static File pluginsettings = new File(System.getProperty("user.home") + System.getProperty("file.separator") + "Spark" + System.getProperty("file.separator") + "ofmeet.properties");

It would create Spark folder in home directory, but Spark's profile is stored in %APPDATA%\Spark, so this should be replaced with

private static File pluginsettings = new File(Spark.getSparkUserHome() + "/ofmeet.properties");