do not send image size on paste inpaint

[light-and-ray]

Description

This PR fixes a very annoying behavior: inpating in image something in "only masked" mode. Press "🎨️" to "commit" the changes. And this button overrides size option. This is wrong

I've just excluded "inpaint" tab from pasting w and h. But there are others solutions:

1. Check "Inpaint area" == "Only masked" in source and ignore only for this case
2. Prioritize "Size" in metadata over image's size. I.e. if it has "Size" in metadata, paste it
3. Remove special handling of image's size at all, and handle it like other metadata. I don't know why you've added this behavior at all, because width and height are the same options like others

I would prefer the last

P.s. shared.opts.send_size has nothing with this case I think, because the behavior for "only masked" inpaint is wrong in any ways

Checklist:

• I have read contributing wiki page
• I have performed a self-review of my own code
• My code follows the style guidelines
• My code passes tests