Fix/result info available qualifier labels (#942)

* Fix property available_qualifier_labels

* Add a small test

* Update tests/test_resultinfo.py

Author: PProfizi

src/ansys/dpf/core/result_info.py

@@ -415,9 +415,7 @@ def available_qualifier_labels(self):
         Available with server's version starting at 5.0.
         """
         coll_obj = collection.StringCollection(
-            collection=self._support_api.result_info_get_available_qualifier_labels_as_string_coll(
-                self
-            ),
+            collection=self._api.result_info_get_available_qualifier_labels_as_string_coll(self),
             server=self._server,
         )
         return coll_obj.get_integral_entries()

tests/test_resultinfo.py

@@ -4,7 +4,6 @@
 from ansys.dpf.core import Model
 from conftest import SERVERS_VERSION_GREATER_THAN_OR_EQUAL_TO_5_0
 
-
 if SERVERS_VERSION_GREATER_THAN_OR_EQUAL_TO_5_0:
     mechanical = "mechanical"
 else: