fix(tongou_sa1_wifi_energy_meter): do not force dp 6, and let it persist

Force is not needed for these types of dp, instead the "Live updates" button should
be used to trigger frequent updates.

The persist: false makes the sensors clear when not being received in full polls, but
for sensors there is no reason to do this, and the sensors will act better if they
retain the last received value.

Discussion #6022

custom_components/tuya_local/devices/tongou_sa1_wifi_energy_meter.yaml

@@ -35,8 +35,6 @@ entities:
         name: sensor
         optional: true
         class: measurement
-        force: true
-        persist: false
         unit: V
         mask: "FFFF000000000000"
         mapping:
@@ -50,8 +48,6 @@ entities:
         name: sensor
         optional: true
         class: measurement
-        force: true
-        persist: false
         unit: A
         mask: "0000FFFFFF000000"
         mapping:
@@ -64,9 +60,7 @@ entities:
         type: base64
         name: sensor
         optional: true
-        persist: false
         class: measurement
-        force: true
         unit: kW
         mask: "0000000000FFFFFF"
         mapping: