Revert "input.conf: bind MBTN_MID to align-to-cursor"

[kasper93]

For symmetry with drag-to-pan. Use MBTN_MID to reset the video position.

[github-actions]

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Windows

• mpv-i686-w64-mingw32
• mpv-x86_64-w64-mingw32
• mpv-x86_64-windows-msvc

macOS

• mpv-macos-13-intel
• mpv-macos-14-arm
• mpv-macos-15-arm

[kasper93]

Whatever.

[na-na-hi]

I would like to see this merged. Panning video just because I clicked on MBTN_MID, not even dragging, with no way to reset with only mouse (it did before but was then broken on purpose because toggle_align_to_cursor feature and copying whatever sxiv does is apparently much more important than sane behavior), is jarring and useless for the vast majority of cases of viewing videos.

And it's not even copying it right in this case. sxiv won't pan the image off-center, so it won't activate when the image isn't already zoomed in, unlike current mpv where it makes video off-center even when not zoomed in.

[kasper93]

I also don't like that MBTN_MID moves the image, especially if it is in nominal state. Image viewers generally allow pan only if image is zoomed in and doesn't fit the view port. This would be acceptable solution for me.

copying whatever sxiv does is apparently much more important than sane behavior

Not sure if we should copy what image viewers do anyway...