hst/grp_pwd: specify new uid format

This leaves slots available for additional uid ranges in Rosa OS.

This breaks all existing installations! Users are required to fix ownership manually.

Closes #18.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/outcome/hsu.go

@@ -95,7 +95,3 @@ func (h *Hsu) MustID(msg message.Msg) int {
 		return -0xdeadbeef // not reached
 	}
 }
-
-// HsuUid returns target uid for the stable hsu uid format.
-// No bounds check is performed, a value retrieved by [Hsu] is expected.
-func HsuUid(id, identity int) int { return 1000000 + id*10000 + identity }