Remove header from overlay file

for consistency (since the rest don't have one). We decided to remove
this directory from the directories scanned by the kairos-agent
anyway, so having a header or not should make no difference since yip
doesn't care about the headers.

Signed-off-by: Dimitris Karakasilis <[email protected]>

packages/static/kairos-overlay-files/files/system/oem/11_RPI.yaml

@@ -1,4 +1,3 @@
-#cloud-config
 name: "RPI configs"
 stages:
   initramfs.before: