Remove useless SuppressWarning in IDEWorkspacePreferencePage

Reported at
https://download.eclipse.org/eclipse/downloads/drops4/I20231212-1800/compilelogs/plugins/org.eclipse.ui.ide_3.22.100.v20231205-1729/@dot.html

bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/IDEWorkspacePreferencePage.java

@@ -1,5 +1,5 @@
  /****************************************************************************
-* Copyright (c) 2000, 2018 IBM Corporation and others.
+* Copyright (c) 2000, 2023 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
@@ -198,7 +198,6 @@ private void createMissingNaturePref(Composite parent) {
 		missingNatureSeverityCombo.load();
 	}
 
-	@SuppressWarnings("restriction")
 	private void createMissingEncodingPref(Composite parent) {
 		missingEncodingSeverityCombo = new ComboFieldEditorInGrid(ResourcesPlugin.PREF_MISSING_ENCODING_MARKER_SEVERITY,
 				IDEWorkbenchMessages.IDEWorkspacePreference_UnknownEncodingSeverity,