Remove wrong 'all_vms' arg in '_create_test_qube()'

The 'all_vms' parameter couldn't be used directly as a fixture in the
qube fixture. This is because 'all_vms' is function-scoped and qube is
module-scoped. The practical solution here is to just us Qubes().domains
direclty.

Author: deeplow

tests/test_viewer.py

@@ -2,6 +2,7 @@
 import subprocess
 
 import pytest
+from qubesadmin import Qubes
 
 from tests.base import (
     QubeWrapper,
@@ -11,9 +12,9 @@
 )
 
 
-def _create_test_qube(dispvm_template_name, all_vms):
+def _create_test_qube(dispvm_template_name):
     # VM was running and needs a restart to test on the latest version
-    if dispvm_template_name in all_vms:
+    if dispvm_template_name in Qubes().domains:
         _kill_test_qube(dispvm_template_name)
 
     # Create disposable based on specified template