main/postmarketos-initramfs: remove -v from losetup args

Ferass El Hafidirequested to merge
funderscore/losetup-ugh into main

It was removed in https://git.kernel.org/pub/scm/utils/util-linux/util-linux.git/commit/sys-utils/losetup.c?id=7e27c815979986666f78696adcfd5d13eab5df36 as it apparently had no effect on anything. Now that it is removed, the initramfs still trying to use it is making complain and do nothing, which results in boot failure.

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