test: Fix bad update to install_karpenter.sh bash script

[jonathan-innis]

Fixes #N/A

Description

Fix bash condition checking

How was this change tested?

make presubmit /karpenter snapshot

Does this change impact docs?

• [ ] Yes, PR includes docs updates
• [ ] Yes, issue opened: #
• [x] No

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[coveralls]

Pull Request Test Coverage Report for Build 10840996519

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.02%) to 83.025%

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Files with Coverage Reduction	New Missed Lines	%
pkg/providers/amifamily/ami.go	1	91.67%
<!--	Total:	1		-->

Totals
Change from base Build 10839007319:	-0.02%
Covered Lines:	5512
Relevant Lines:	6639

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💛 - Coveralls