fix: Fixed missing type exception when drawing a generic object selector in Unity 2020

Disabled ObjectSelectorSearch.HasEngineOverride altogether because it doesn't seem to be needed for drawing generic unity objects, but it causes issues with compatibility between Unity 2020 and 2021.

Author: SolidAlloy

GenericUnityEditorInternals.dll

@@ -67,7 +67,10 @@ public static void ShowGeneric(this ObjectSelector this_, Object obj, Object obj
             this_.m_ModalUndoGroup = Undo.GetCurrentGroup();
 
             // Show custom selector if available
-            if (ObjectSelectorSearch.HasEngineOverride())
+
+            // It seems this branch isn't used for generic unity objects, but it causes issues because ObjectSelectorSearch
+            // is named differently in Unity2020 and 2021. Disabling it doesn't seem to break anything.
+            /*if (ObjectSelectorSearch.HasEngineOverride())
             {
                 this_.m_SearchSessionHandler.BeginSession(() =>
                 {
@@ -119,7 +122,7 @@ void OnSelectorClosed(Object selectedObj, bool canceled)
 
                 if (ObjectSelectorSearch.SelectObject(searchContext, OnSelectorClosed, OnSelectionChanged))
                     return;
-            }
+            }*/
 
             // Freeze to prevent flicker on OSX.
             // Screen will be updated again when calling