[escher/code] Cleaned Toolbox rowHeight().

Now it is set in escher/toolbox.h, with value 40 and no differentiation Node/Leaf.

Change-Id: I0809d87a5df5b8bffe201c9faf72ff901430cbe5

escher/src/toolbox.cpp

@@ -118,6 +118,10 @@ void Toolbox::viewDidDisappear() {
   m_selectableTableView.deselectTable();
 }
 
+KDCoordinate Toolbox::rowHeight(int j) {
+  return sToolboxRowHeight;
+}
+
 int Toolbox::numberOfRows() {
   if (m_messageTreeModel == nullptr) {
     m_messageTreeModel = (ToolboxMessageTree *)rootModel();