Spin state dir not being created

[kate-goldenring]

After moving to using Spin factors in #189, it seems we are no longer creating a state dir. This is probably due to setting remaining factors config (including state dir) to default. The result is that embedded SQLite is no longer working. For example, a simple todo app on shim v0.16 has the.spin state dir:

$ sudo ls -a /run/k3s/containerd/io.containerd.runtime.v2.task/k8s.io/c2045da87dc7194596d90481430cc57c509952c5375777b5be162bc638c3cdd0/rootfs
.  ..  assets  .cache  dev  etc  proc  runtime-config.toml  .spin  spin.json  spin.lock  sys  var
$ sudo ls -a /run/k3s/containerd/io.containerd.runtime.v2.task/k8s.io/c2045da87dc7194596d90481430cc57c509952c5375777b5be162bc638c3cdd0/rootfs/.spin
.  ..  sqlite_db.db

However, canary no longer has .spin in it's rootfs:

sudo ls -a /run/k3s/containerd/io.containerd.runtime.v2.task/k8s.io/8fcf674a69594014ada4e1bb88ac635bc87388673ac4209480f959390430421e/rootfs
.  ..  assets  .cache  dev  etc  proc  runtime-config.toml  spin.json  sys  var