AddToPlayerScreen not filling of player screen by widget.

At screen resolutions other than 16: 9, widgets added with AddToPlayerScreen can not be completely filled. The final size calculated by GameLayerManager seems to be incomplete.

[Repro Stepst]

1. Set New Window Size Width=1280 / Height=640 in Editor Preference.
2. Create widget and add image which set anchors Minimum X:0.0 / Y:0.0 and Maximum X:1.0 / Y:1.0.
3. Add camera actor in level for the default camera.
4. Adding CreateWidget and AddToPlayerScreen for BeginPlay in LevelEditorBP.
5. Run PIE with NewEditorWindow.          

Result:

Not filling widget in player screen.(see attached .png) 

Expect:

Filling with widget in player screen.

[Repro Project]

1. Open the attached project in 4.22.3.
2. Run PIE with NewEditorWindow.

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