Remove unused SuppressWarnings

Fixes warning as listed in
https://download.eclipse.org/eclipse/downloads/drops4/I20250317-1800/compilelogs/plugins/org.eclipse.equinox.p2.ui.discovery_1.3.600.v20250317-0608/@dot.html

Author: akurtakov

bundles/org.eclipse.equinox.p2.ui.discovery/src/org/eclipse/equinox/internal/p2/ui/discovery/util/PatternFilter.java

@@ -30,7 +30,6 @@
  * @see org.eclipse.ui.dialogs.FilteredTree
  * @since 3.2
  */
-@SuppressWarnings("restriction")
 public class PatternFilter extends ViewerFilter {
 	/*
 	 * Cache of filtered elements in the tree