Update solax_sx4.yaml

Author: Meatballs1

templates/solax_sx4.yaml

@@ -289,7 +289,7 @@ 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: 're:(event.octopus_energy([0-9a-z_]+|)_saving_session_event(s|)'
+  octopus_saving_session: 're:(event.octopus_energy([0-9a-z_]+|)_saving_session_event(s|))'
   octopus_saving_session_octopoints_per_penny: 8
 
   # Octopus free session points to the free session Sensor in the Octopus plugin