Add space to match what's on the Smile

Author: bouwew

plugwise/smile.py

@@ -517,7 +517,7 @@ async def set_schedule_state(self, loc_id: str, name: str, state: str) -> bool:
             template_id = self._domain_objects.find(locator).attrib["id"]
             template = f'<template id="{template_id}" />'
             if state == "off":
-                contexts = "<contexts></contexts>"
+                contexts = "<contexts> </contexts>"
             if state == "on":
                 contexts = f'<contexts><context><zone><location id="{loc_id}" /></zone></context></contexts>'
         else:  # Adam