Use DefaultScope instead of InstanceScope for full screen preference

- This is better as it doesn't need to write to the org.eclipse.ui.workbench.prefs file

com.archimatetool.editor/src/com/archimatetool/editor/ArchiWorkbenchAdvisor.java

@@ -5,8 +5,8 @@
  */
 package com.archimatetool.editor;
 
+import org.eclipse.core.runtime.preferences.DefaultScope;
 import org.eclipse.core.runtime.preferences.IEclipsePreferences;
-import org.eclipse.core.runtime.preferences.InstanceScope;
 import org.eclipse.jface.dialogs.TrayDialog;
 import org.eclipse.jface.preference.IPreferenceNode;
 import org.eclipse.jface.preference.PreferenceManager;
@@ -88,8 +88,8 @@ public void initialize(IWorkbenchConfigurer configurer) {
 
         // We use Eclipse's org.eclipse.ui.internal.handlers.FullScreenHandler which shows
         // a popup with a message to tell you this and a "do not show again" checkbox.
-        // This is hard to see and unnecessary, so set this preference now so it doesn't show.
-        IEclipsePreferences prefs = InstanceScope.INSTANCE.getNode("org.eclipse.ui.workbench");
+        // This is hard to see and unnecessary, so set the default preference to false now so it doesn't show.
+        IEclipsePreferences prefs = DefaultScope.INSTANCE.getNode("org.eclipse.ui.workbench");
         if(prefs != null) {
             prefs.putBoolean("org.eclipse.ui.window.fullscreenmode.donotshowinfoagain", true);
         }