MAINT - Update to comply with flake8 W504

This commit updates code that was styled to comply with [flake8 rule
W503](https://lintlyci.github.io/Flake8Rules/rules/W503.html) to comply
with [W504](PyCQA/pycodestyle#498) instead.

Author: John Duarte

molecule/default/tests/test_hypervisor_free.py

@@ -70,7 +70,7 @@ def test_hypervisor_free(host):
     assert "vcpus" in stats
     assert "vcpus_used" in stats
     assert "free_disk_gb" in stats
-    assert ((stats['memory_mb']) * ram_ratio -
-            (stats['memory_mb_used'])) / 1024 > 0
+    assert ((stats['memory_mb']) * ram_ratio
+            - (stats['memory_mb_used'])) / 1024 > 0
     assert (stats['vcpus'] * cpu_ratio - stats['vcpus_used']) > 0
     assert (stats['free_disk_gb'] * disk_ratio) > 0