ctrl_panel: Approriate units for measured current

Allow the readonly display of current to vary its SI prefix in the unit,
since as a display entry it won't have the unit adjustment problem.

pytec/pytec/gui/view/ctrl_panel.py

@@ -161,7 +161,7 @@ class CtrlPanel(QObject):
                     )
                     if settings["tec_i"] is not None:
                         self.params[channel].child("tec_i").setValue(
-                            settings["tec_i"] * 1000
+                            settings["tec_i"]
                         )
 
     @pyqtSlot("QVariantList")

pytec/pytec/gui/view/param_tree.json

@@ -12,7 +12,8 @@
          "name": "tec_i",
          "title": "Current through TEC",
          "type": "float",
-         "suffix": "mA",
+         "siPrefix": true,
+         "suffix": "A",
          "decimals": 6,
          "readonly": true,
          "tip": "The measured current through the TEC"