hst: remove template bind nix store

This does not add anything meaningful to the template, since there are already prior examples showing src-only bind ops. Remove this since it causes confusion by covering the previous mount point targeting /nix/store.

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

hst/hst_test.go

@@ -198,10 +198,6 @@ func TestTemplate(t *testing.T) {
 				"upper": "/var/lib/hakurei/nix/u0/org.chromium.Chromium/rw-store/upper",
 				"work": "/var/lib/hakurei/nix/u0/org.chromium.Chromium/rw-store/work"
 			},
-			{
-				"type": "bind",
-				"src": "/nix/store"
-			},
 			{
 				"type": "link",
 				"dst": "/run/current-system",