Reinstate auto-restart on btproxy 15min silence

Too early -- Laundry BT still needs this.

This reverts commit d40da1a871.

templates/btproxy.yaml

@@ -26,6 +26,7 @@ esp32_ble_tracker:
       - sensor.template.publish:
           id: ble_scans_finished
           state: !lambda 'return ++id(ble_scans);'
+      - script.execute: restart_after_delay
 
 bluetooth_proxy:
   id: btproxy
@@ -35,6 +36,16 @@ bluetooth_proxy:
 esp32_ble:
   max_connections: 4
 
+script:
+  - id: restart_after_delay
+    mode: restart
+    then:
+      - delay: 15min
+      - logger.log:
+          level: ERROR
+          format: "No recent successful Bluetooth scan, restarting ESP chip"
+      - button.press: restart_button
+
 sensor:
   - platform: template
     name: "BLE scans finished"