register 5725 total backup power should have int32 (#361)

* register 5725 total backup power should have int32

this register line other backup power registers should be changed to 32 integer as per sungrow manual but should also remain as signed power - as that part is a typo from sungrow.

modbus_sungrow.yaml

@@ -1,7 +1,7 @@
 # Home Assistant Sungrow inverter integration
 # https://github.com/mkaiser/Sungrow-SHx-Inverter-Modbus-Home-Assistant
 # by Martin Kaiser
-# last update: 2024-10-01 (2)
+# last update: 2024-10-12
 #
 # Note: This YAML file will only work with Home Assistant >= 2023.10
 
@@ -334,7 +334,7 @@ modbus:
         unique_id: sg_total_backup_power
         address: 5725 # reg 5726
         input_type: input
-        data_type: int16
+        data_type: int32
         precision: 0
         unit_of_measurement: W
         device_class: power