helm: fix failure to cleanup psp fully

I failed to save a file before making the commit becomign PR #16558.
This small change should also have been part of it.

Signed-off-by: Erik Sundell <erik@sundellopensource.se>

build/rbac/keep-rbac-yaml.sh

@@ -20,7 +20,6 @@ pushd "${temp_dir}" &>/dev/stderr
 # just read in the files, sorted by the fs for final output.
 
 $YQ eval '
-    select(.kind == "PodSecurityPolicy"),
     select(.kind == "ServiceAccount"),
     select(.kind == "ClusterRole"),
     select(.kind == "ClusterRoleBinding"),