fix msaaSamples parameter error when msaa is disable: Error caught by scheduler library, thrown during a scheduler callback. RenderTextureDesc msaaSamples must be 1, 2, 4, or 8.

Runtime/editor/surface.cs

             var desc = new RenderTextureDescriptor(
                 (int) this.size.width, (int) this.size.height,
                 RenderTextureFormat.Default, 24) {
-                msaaSamples = QualitySettings.antiAliasing,
+
+            if (QualitySettings.antiAliasing != 0)
+            {
+                desc.msaaSamples = QualitySettings.antiAliasing;
+            }
 
             this._renderTexture = new RenderTexture(desc);
         }

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