internal: allow setting useLastImageOnLoad on StreamingImageSequenceRenderer (#451)

Author: sindharta

Runtime/Scripts/StreamingImageSequenceRenderer.cs

@@ -118,11 +118,14 @@ internal void UpdateTexture(Texture2D tex) {
 
     }
 
-//----------------------------------------------------------------------------------------------------------------------
-    
-    internal bool ShouldUseLastImageOnLoad() { return m_useLastImageOnLoad; }
+//--------------------------------------------------------------------------------------------------------------------------------------------------------------
+
+    internal void SetUseLastImageOnLoad(bool useLastImageOnLoad) {
+        m_useLastImageOnLoad = useLastImageOnLoad;
+    }
+    internal bool ShouldUseLastImageOnLoad() => m_useLastImageOnLoad;
 
-//----------------------------------------------------------------------------------------------------------------------
+//--------------------------------------------------------------------------------------------------------------------------------------------------------------
 
     void InitImageComponent() {
         m_image = GetComponent<Image>();