Fix lifespans being reported much lower than reality

Original implementation assumed that the "total" value from the API response was the denominator for lifespan, but this was incorrect. The "val" from the `life_span` message is the percentage represented as a whole number, with no dividing necessary.

sucks/__init__.py

@@ -296,9 +296,7 @@ class VacBot():
         except KeyError:
             _LOGGER.warning("Unknown component type: '" + type + "'")
 
-        total = float(event['total'])
-        val = float(event['val'])
-        lifespan = val / total
+        lifespan = int(event['val']) / 100
         self.components[type] = lifespan
 
         lifespan_event = {'type': type, 'lifespan': lifespan}