Fix Influx Token environment variable name

The service definition of the FMS Server component has used a wrong
environment variable name to determine the path to the token used
for authenticating to InfluxDB.

This has been fixed.

fms-blueprint-compose.yaml

@@ -120,7 +120,7 @@ services:
         condition: service_healthy
     env_file: "./influxdb/fms-demo.env"
     environment:
-      INFLUXDB_API_TOKEN_FILE: "/tmp/fms-demo.token"
+      INFLUXDB_TOKEN_FILE: "/tmp/fms-demo.token"
       RUST_LOG: "info"
     volumes:
     - type: "volume"