Makes updater logs more readable, running VMs

The qvm-ls output wasn't easy on the eyes, so reformatted as a list. A
bit cautious around chaining formatting specifically for logs when we're
already in a try block, but these changes are darn simple.

launcher/sdw_updater_gui/Updater.py

@@ -459,7 +459,7 @@ def _safely_start_vm(vm):
     try:
         running_vms = subprocess.check_output(
             ["qvm-ls", "--running", "--raw-list"], stderr=subprocess.PIPE
-        )
+        ).decode("utf-8").strip().split("\n")
         sdlog.info("VMs running before start of {}: {}".format(vm, running_vms))
         subprocess.check_output(
             ["qvm-start", "--skip-if-running", vm], stderr=subprocess.PIPE