Revert "makechrootpkg: sync_chroot: Make more general."

This reverts commit 6d1992909cc46e293027ff488ae2632047603e66.

It has never worked. In commit c86823a2d4a4152c71faa1c3bab227756232996f
it was noted that it compared the device numbers for [[ $1 = $1 ]] which
was a useless check and always returned true, for *any* btrfs
filesystem. Now that the function is corrected to compare [[ $1 = $2 ]]
the check is still useless, but this time because it always returns
false -- btrfs subvolumes on the same filesystem do *not* share device
numbers.

So let's go back to the original working implementation that only
matters in terms of makechrootpkg, and just checks if makechrootpkg's
root working directory is btrfs (in which case we know it will be a
subvolume because mkarchroot will create it that way).

This restores our special support for the btrfs filesystem.

Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>

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