Fix indentation for ServiceAccount pullSecrets

[cognifloyd]

I had the indentation wrong for imagePullSecrets in #196

I have a branch prepared to fix it: https://github.com/cognifloyd/stackstorm-ha/tree/fix-sa-pullsecret
I will submit a PR later.

[arm4b]

It would be really nice to go directly with the PR creation here, considering 2 lines change bugfix.

[cognifloyd]

I'm juggling a lot of branches. I want to finish polishing additional PRs after the current sensor PRs are merged.

I submitted the issues to make sure they don't get lost, and to make sure we don't make a release without including at least the bug fixes.