[#4808] Fix screenshot OSD layout issue

[yuxiqian]

• I have read CONTRIBUTING.md
• This implements/fixes issue Conflicting constraints detected when taking a screenshot #4808.

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IINA resizes screenshot NSImage before passing it to OSD for previewing with a fixed expectation size [300, 200]. The resizing strategy is implemented in NSSize#shrink, which guarantees the shrunken width or height to be given value, and decreasing the other side while keeping the image aspect.

This works in most cases except the reported one which has a 1:1 ratio. So by the shrinking rule, it will be resized to [200, 200], which breaks the layout rule since OSD View expects a minimum width to place action buttons.

Replacing the strategy to NSSize#grow ensures the resized width >= 300 and resolves layout warnings.

Grow strategy for 1:1 ratio image:

Shrink strategy for 1:1 ratio image:

For those normal images close to 3:2 ratio, this fix shouldn't cause any significant visual changes.

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Off topic: I noticed that there's a typo in ScreenshootOSDView class name. Wanted to fix it but I'm a little worried that it might break the localization.

[uiryuu]

Using shrink here is to ensure that the image displayed in the accessoryView is constrained by the size [200, 300]. When the aspect ratio of the video is very unbalanced, the accessoryView could be very large if using grow. An extreme example:

Using grow:

Using shrink:

I suggest find a different approach to solve this issue.