refactor(new_editor): unify d3d12 text run caching

new_editor/app/Platform/Win32/EditorWindowRuntimeController.h

@@ -114,6 +114,7 @@ private:
     float m_frameStatsDisplayAccumulatorSeconds = 0.0f;
     float m_displayFps = 0.0f;
     float m_displayFrameTimeMs = 0.0f;
+    float m_dpiScale = 1.0f;
     std::string m_frameRateText = {};
     bool m_ready = false;
 };