Fix typo in wxWebViewEdgeImpl::Uninitialize() name

As this is a private header, we can fix this without any compatibility
concerns.

Thanks codespell for finding it.

include/wx/msw/private/webview_edge.h

@@ -68,7 +68,7 @@ public:
 
     static bool Initialize();
 
-    static void Uninitalize();
+    static void Uninitialize();
 
     friend class wxWebViewEdgeModule;
 };