Minor bugs in GameUserSettings.cpp

Examples:

1.Cannot set FoliageQuality to 4 (Cinematic) though GameUserSettings. It is clamped to 3. (Hint: Line 837 of GameUserSettings.cpp).

2.ShadowQuality is not clamped at all. (Hint: Line 787 of GameUserSettings.cpp).

3.etc.

Can be reproduced with blueprints:

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