Issue #1555: Remove unused parameters

Fixes some `UnusedParameters` inspection violations.

Description:
>This inspection reports parameters that are not used by their methods and all method implementations/overriders.

src/main/java/com/puppycrawl/tools/checkstyle/gui/AbstractTreeTableModel.java

@@ -211,7 +211,7 @@ public abstract class AbstractTreeTableModel implements TreeTableModel {
      *  and keyboard events in the Tree column to the underlying JTree.
      */
     @Override
-    public boolean isCellEditable(Object node, int column) {
+    public boolean isCellEditable(int column) {
         return getColumnClass(column) == TreeTableModel.class;
     }
 }

src/main/java/com/puppycrawl/tools/checkstyle/gui/TreeTableModel.java

@@ -66,9 +66,8 @@ public interface TreeTableModel extends TreeModel {
      * Indicates whether the the value for node {@code node},
      * at column number {@code column} is editable.
      *
-     * @param node the node.
      * @param column the column number
      * @return true if editable
      */
-    boolean isCellEditable(Object node, int column);
+    boolean isCellEditable(int column);
 }

src/main/java/com/puppycrawl/tools/checkstyle/gui/TreeTableModelAdapter.java

@@ -95,7 +95,7 @@ public class TreeTableModelAdapter extends AbstractTableModel {
 
     @Override
     public boolean isCellEditable(int row, int column) {
-        return treeTableModel.isCellEditable(nodeForRow(row), column);
+        return treeTableModel.isCellEditable(column);
     }
 
     /**