chore: remove invalid err check

[kkzhui]

What type of PR is this?
/kind cleanup
What this PR does / why we need it:
remove invalid err check

Special notes for your reviewer:

Does this PR introduce a user-facing change?:
NONE

Signed-off-by: zenghui.li [zenghui.li@daocloud.io]

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Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
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[crenshaw-dev]

Thanks, @kkzhui!

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@bab74b5). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #13040   +/-   ##
=========================================
  Coverage          ?   48.98%           
=========================================
  Files             ?      246           
  Lines             ?    42484           
  Branches          ?        0           
=========================================
  Hits              ?    20812           
  Misses            ?    19560           
  Partials          ?     2112           

Impacted Files	Coverage Δ
cmd/argocd/commands/admin/backup.go	0.00% <ø> (ø)

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