Remove % sign from Vera Battery Levels (#8069)

Vera devices are reporting battery levels as a sting by appending a
percentage sign (%) on the end.

To make the Vera component act like other Home Assistant components,
let's remove the percentage sign from the battery report levels so that
we only display the battery level.

This may be a "breaking change" if people are relying on the Vera
battery levels to be a string instead of an int. However, this will make
the battery level reports compatible with everything else.

homeassistant/components/vera.py

@@ -164,7 +164,7 @@ class VeraDevice(Entity):
         attr = {}
 
         if self.vera_device.has_battery:
-            attr[ATTR_BATTERY_LEVEL] = self.vera_device.battery_level + '%'
+            attr[ATTR_BATTERY_LEVEL] = self.vera_device.battery_level
 
         if self.vera_device.is_armable:
             armed = self.vera_device.is_armed