Remove unnessarily duplicated parameter tree

Huge source of confusion and easy bugs!

pytec/pytec/gui/view/ctrl_panel.py

@@ -65,14 +65,12 @@ class CtrlPanel(QObject):
         self.trees_ui = trees_ui
         self.NUM_CHANNELS = len(trees_ui)
 
-        self.THERMOSTAT_PARAMETERS = [param_tree for i in range(self.NUM_CHANNELS)]
-
         self.params = [
             Parameter.create(
                 name=f"Thermostat Channel {ch} Parameters",
                 type="group",
                 value=ch,
-                children=self.THERMOSTAT_PARAMETERS[ch],
+                children=param_tree,
             )
             for ch in range(self.NUM_CHANNELS)
         ]