qubes-session-autostart: do not wait for applications exit

Since fixing QubesOS/qubes-issues#3213, launch function correctly waits
for some applications exit. This is undesirable for
qubes-session-autostart service, which should just start the
applications and exit.

misc/qubes-session-autostart

@@ -76,7 +76,7 @@ def process_autostart(environments):
                 else:
                     entry = DesktopEntry(entry_path)
                 if entry_should_be_started(entry, environments):
-                    launch(entry_path)
+                    launch(entry_path, wait=False)
             except Exception as e:
                 print >>sys.stderr, "Failed to process '{}': {}".format(
                     entry_name, str(e)