Removed unused useEffect.

src/app/Marine2/components/boxes/EnvironmentOverview/EnvironmentOverview.tsx

@@ -1,6 +1,6 @@
 import { observer } from "mobx-react-lite"
 import { useTemperatures, TemperatureInstanceId } from "@victronenergy/mfd-modules"
-import { useState, createContext, useCallback, useEffect } from "react"
+import { useState, createContext, useCallback } from "react"
 import { useVisibilityNotifier } from "../../../modules"
 import Box from "../../ui/Box"
 import TemperatureData from "./TemperatureData"