Add 2 preference values to restore main window x and y.

ChangeLog

+4.0.32 dd/mm/2020
+------
+* Add 2 preference values to restore main window x and y.
+
 4.0.31 13/08/2020
 ------
 * Get NomadServerEndpoint from ServerInstance instead of ConfigManager (the latter does not take account of main/remote client types)

src/main/java/fr/ill/ics/util/ConfigManager.java

@@ -92,6 +92,8 @@ public class ConfigManager {
 	public final static String LAUNCH_PAD_TEXT_MODE = "LAUNCH_PAD_TEXT_MODE";
 	public final static String X_UNCLOSEABLE_SPY = "X_UNCLOSEABLE_SPY";
 	public final static String Y_UNCLOSEABLE_SPY = "Y_UNCLOSEABLE_SPY";
+	public final static String X_MAIN_WINDOW = "X_MAIN_WINDOW";
+	public final static String Y_MAIN_WINDOW = "Y_MAIN_WINDOW";
 	public final static String MAGNIFY_FACTOR_INDEX = "MAGNIFY_FACTOR_INDEX";
 	public final static String REMOTE_USER_NAME = "REMOTE_USER_NAME";
 	public final static String REMOTE_INSTRUMENT = "REMOTE_INSTRUMENT";