coreutils: remove hack for busybox test suite

[oech3]

Hacks

coreutils/src/bin/coreutils.rs

Line 72 in e526430

} else if is_coreutils || binary_as_util.ends_with("box") {

coreutils/src/bin/coreutils.rs

Lines 141 to 145 in e526430

	// GNU just fails, but busybox tests needs usage
	// todo: patch the test suite instead
	if binary_as_util.ends_with("box") {
	usage(&utils, binary_as_util);
	} else {

are no longer needed with master branch of busybox mirror/busybox#117 (comment) .