Seems that after merging https://github.com/kubernetes/kops/pull/9534
there is no need to specify paths for key-files for service Account
Token Volume Projection. Instead, current configuration proposed is
making Istio unable to verify JWT token with errors.
In this commit, we remove the paths, letting Kops handles the default
ones that are working as expected.
Signed-off-by: dntosas <ntosas@gmail.com>