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 going through the TEC"