Fixed version handler update on asset change.

OnPostprocessAllAssets() was in the incorrect case and never
being called.

Bug: 128746526
Change-Id: I134a1d1cb880dca2698028344d788bb67ad0f83c

Author: Stewart Miles

source/VersionHandlerImpl/src/VersionHandlerImpl.cs

@@ -2658,7 +2658,7 @@ public static float GetUnityVersionMajorMinor() {
     /// <summary>
     /// Scanned for versioned assets and apply modifications if required.
     /// </summary>
-    private static void OnPostProcessAllAssets (
+    private static void OnPostprocessAllAssets(
             string[] importedAssets, string[] deletedAssets,
             string[] movedAssets, string[] movedFromPath) {
         UpdateVersionedAssets();