tests: Fix expected value for "has_key" with latest blivet

LUKS.has_key was changed to always return boolean in the latest
blivet (see storaged-project/blivet#1142)
so we need to change expected value here.

tests/unit_tests/pyanaconda_tests/modules/storage/test_module_device_tree.py

@@ -305,7 +305,7 @@ def test_get_format_data(self):
         assert self.interface.GetFormatData("dev2") == {
             'type': get_variant(Str, 'luks'),
             'mountable': get_variant(Bool, False),
-            'attrs': get_variant(Dict[Str, Str], {}),
+            'attrs': get_variant(Dict[Str, Str], {'has_key': 'False'}),
             'description': get_variant(Str, 'LUKS'),
         }
 
@@ -682,7 +682,7 @@ def test_unlock_device(self, device_setup, device_teardown, format_setup):
         assert self.interface.GetFormatData("dev2") == {
             'type': get_variant(Str, 'luks'),
             'mountable': get_variant(Bool, False),
-            'attrs': get_variant(Dict[Str, Str], { }),
+            'attrs': get_variant(Dict[Str, Str], {'has_key': 'False'}),
             'description': get_variant(Str, 'LUKS'),
         }