piket_client: Disable add CT

piket_client/gui.py

         self.toolbar.addWidget(self.create_spacer())
 
         # Right
-        self.toolbar.addAction(
-            self.load_icon("add_consumption_type.png"),
-            "Nieuw",
-            self.add_consumption_type,
-        )
+        # self.toolbar.addAction(
+        #     self.load_icon("add_consumption_type.png"),
+        #     "Nieuw",
+        #     self.add_consumption_type,
+        # )
         self.toolbar.setContextMenuPolicy(Qt.PreventContextMenu)
         self.toolbar.setFloatable(False)
         self.toolbar.setMovable(False)