Update internal/orchestrator/bricks/testdata/my-app.override/app.yaml

Co-authored-by: Luca Rinaldi <l.rinaldi@arduino.cc>

Author: dido18

internal/orchestrator/bricks/testdata/my-app.override/app.yaml

@@ -1,9 +1,9 @@
 name: Copy of Blinking LED from Arduino Cloud
 description: Control the LED from the Arduino IoT Cloud using RPC calls
+icon: ☁️
 ports: []
 bricks:
 - arduino:arduino_cloud:
     variables:
       ARDUINO_DEVICE_ID: this-is-a-device-id
       ARDUINO_SECRET: this-is-a-secret
-icon: ☁️