Fix pty's pixelsize being zero until resize

[kchibisov]

117719b removed the extra call for TIOCSWINSZ, however the first call was not setting the pixelsize for unknown reason, which regressed some clients.

Fixes: 117719b (Remove extra TIOCSWINSZ)

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It was like that since the start of alacritty, and then it was just carried. The second call to resize the PTY just masked the issue.

[chrisduerr]

unknown reason

It's not an unknown reason. ws_xpixel and ws_ypixel are unused according to kernel documentation.

Which application is relying on these?

[kchibisov]

It's not an unknown reason. ws_xpixel and ws_ypixel are unused according to kernel documentation.

#4763 (comment)

We also set it via on_resize so we should either never set it or we should always set it.

Right now we don't set it for create, but we set it later, and it was also always set before, so don't see why we shouldn't stick to behavior we had.

[chrisduerr]

I suppose there's no reason not to set it if we have the information, even if it shouldn't be used. It's also just simpler, which is nice.