chroot: apk: fix local package paths
In f5122420 ("TEMP: chroot: apk: run apk through QEMU again (MR 2351)") we switched back to running apk inside the chroot. But the paths to local packages weren't updated. Fix them so that we correctly use the local versions of packages.
Signed-off-by: Caleb Connolly caleb@postmarketos.org