Reverted change to hook kernel container image in hook.yaml after successful test

Signed-off-by: Jon Polom <jon@subly.me>

Author: jmpolom

hook.yaml

@@ -1,6 +1,5 @@
 kernel:
- #  image: quay.io/tinkerbell/hook-kernel:5.10.85
-  image: docker.io/sublyme/hook-kernel:5.10.85-testing
+  image: quay.io/tinkerbell/hook-kernel:5.10.85
   cmdline: "console=tty0 console=ttyS0 console=ttyAMA0 console=ttysclp0"
 init:
   - linuxkit/init:v0.8