some warning removals

com.unity.perception/Editor/GroundTruth/PerceptionCameraEditor.cs

 using System;
 using System.Collections.Generic;
-using System.IO;
 using UnityEditorInternal;
 using UnityEngine;
 using UnityEngine.Perception.GroundTruth;
         PerceptionCamera perceptionCamera => ((PerceptionCamera)this.target);
 
         string m_PreviousOutputDir;
-        bool showPatchChangedLabel = false;
+        bool m_ShowPatchChangedLabel;
 
         public void OnEnable()
         {
                 {
                     Debug.Log($"Chose path: {path}");
                     PlayerPrefs.SetString(SimulationState.userBaseDirectoryKey, path);
-                    showPatchChangedLabel = true;
+                    m_ShowPatchChangedLabel = true;
-            if (showPatchChangedLabel)
+            if (m_ShowPatchChangedLabel)
             {
                 if (m_PreviousOutputDir == dir)
                 {
                 }
                 else
                 {
-                    showPatchChangedLabel = false;
+                    m_ShowPatchChangedLabel = false;
                 }
             }