sea.py: fix status datatype

sea status is a string (not a tuple) and needs therefore
special treatment.
interestingly this bug did not yet appear ...

secop_psi/sea.py

@@ -533,11 +533,14 @@ class SeaModule(Module):
                 if key == 'target':
                     kwds['readonly'] = False
                 prev = cls.accessibles[key]
+                if key == 'status':
+                    # special case: status from sea is a string, not the status tuple
+                    pobj = prev.copy()
+                else:
                     pobj = Parameter(**kwds)
                     merged_properties = prev.propertyValues.copy()
                     pobj.updateProperties(merged_properties)
                     pobj.merge(merged_properties)
-                datatype = kwds.get('datatype', cls.accessibles[key].datatype)
             else:
                 pobj = Parameter(**kwds)
             datatype = pobj.datatype