Update fox.yaml (#1411)

templates/fox.yaml

@@ -255,7 +255,7 @@ pred_bat:
 
   # Octopus saving session points to the saving session Sensor in the Octopus plugin, when enabled saving sessions will be at the assumed
   # Rate is read automatically from the add-in and converted to pence using the conversion rate below (default is 8)
-  octopus_saving_session: binary_sensor.octopus_energy_a_d2fe5dd6_octoplus_saving_sessions
+  octopus_saving_session: 're:(binary_sensor.octopus_energy([0-9a-z_]+|)_saving_session(s|))'
   octopus_saving_session_octopoints_per_penny: 8
 
   # Energy rates