Use find not findall

Author: bouwew

plugwise/legacy/smile.py

@@ -215,8 +215,7 @@ async def set_schedule_state(
             new_state = "true"
 
         locator = f'.//*[@id="{schedule_rule_id}"]/template'
-        for rule in self._domain_objects.findall(locator):
-            template_id = rule.attrib["id"]
+        template_id = self._domain_objects.find(locator).attrib["id"]
 
         data = (
             "<rules>"