enable warning 4296: 'operator': expression is always false

Signed-off-by: Esteban Papp <81431996+amznestebanpapp@users.noreply.github.com>

Code/Editor/Undo/Undo.cpp

@@ -49,7 +49,7 @@ public:
     }
     void Undo(bool bUndo) override
     {
-        for (size_t i = m_undoSteps.size() - 1; i >= 0; i--)
+        for (int i = static_cast<int>(m_undoSteps.size()) - 1; i >= 0; i--)
         {
             m_undoSteps[i]->Undo(bUndo);
         }