Show all element information fields for terminals

Terminal elements only offered eight information fields in the
diagram editor (formula, label, comment, designation, manufacturer,
manufacturer reference, machine manufacturer reference, supplier).
That subset was chosen in faf4235be, before the size, quantity and
auxiliary fields existed, so a terminal could not be given a width,
height, depth or type.

sources/qetinformation.cpp

@@ -437,16 +437,3 @@ QStringList QETInformation::elementEditorElementInfoKeys()
 						 ELMT_UNITY_AUX4 };
 	return list;
 }
-
-QStringList QETInformation::terminalElementInfoKeys()
-{
-	QStringList list = { ELMT_FORMULA,
-						 ELMT_LABEL,
-						 ELMT_COMMENT,
-						 ELMT_DESIGNATION,
-						 ELMT_MANUFACTURER,
-						 ELMT_MANUFACTURER_REF,
-						 ELMT_MACHINE_MANUFACTURER_REF,
-						 ELMT_SUPPLIER };
-	return list;
-}