Fixing test compile error and mistake in RenderTextureReader

com.unity.perception/Runtime/GroundTruth/RenderTextureReader.cs

         /// <param name="waitForAllImages">Whether this should block on waiting for asynchronous readbacks</param>
         public void Dispose(bool waitForAllImages)
         {
-            WaitForAllImages();
+            if (waitForAllImages)
+                WaitForAllImages();
+            
             if (m_CpuTexture != null)
             {
                 Object.Destroy(m_CpuTexture);

com.unity.perception/Tests/Runtime/GroundTruthTests/TestHelper.cs

 using System.Diagnostics;
 using System.Text.RegularExpressions;
 using Unity.Collections;
+#if UNITY_EDITOR
+#endif
 using UnityEngine;
 using UnityEngine.Experimental.Rendering;
 using UnityEngine.Perception.GroundTruth;
             callback(data);
         }
 
-        [Conditional("UNITY_EDITOR")]
+#if UNITY_EDITOR
         public static void LoadAndStartRenderDocCapture()
         {
             UnityEditorInternal.RenderDoc.Load();
         {
             UnityEditorInternal.RenderDoc.EndCaptureRenderDoc(s_GameView);
         }
+#endif
 
         public static string NormalizeJson(string json, bool normalizeFormatting = false)
         {