Re-add "Square" crop and remove "Freeform"

[faisal-alvi]

Describe the bug

As a conclusion of the following discussions,

• Enhancement/128 ”Skip cropping” + “Free cropping area” added! #130 (comment)
• And from Add: Crop area options: Square, Freeform #131 (comment) to Add: Crop area options: Square, Freeform #131 (comment)

It is concluded that we should remove the freeform crop ability (and re-add the square crop ability) and we can consider that in the future if we get more user requests.

Steps to Reproduce

1. Edit your profile.
2. Try to set the avatar.
3. You can crop the avatar in any shape (freeform ability), it's not strict to the square shape.

Screenshots, screen recording, code snippet

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Environment information

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WordPress information

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