fix rewards points (bp #10914)

[mergify]

This is an automated backport of pull request #10914 done by Mergify

Cherry-pick of 7cc2a68 has failed:

On branch mergify/bp/v1.2/pr-10914
Your branch is up to date with 'origin/v1.2'.

You are currently cherry-picking commit 7cc2a6801.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:

	modified:   programs/stake/src/stake_state.rs
	modified:   programs/vote/src/vote_state/mod.rs
	modified:   runtime/src/bank.rs
	modified:   runtime/src/stakes.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)

	both modified:   runtime/src/serde_snapshot/tests.rs

To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

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