[4x] Minor fix for babel_index_nulls_order_before_15_5 test

[xhfanhe]

Description

This commit fixes typo in babel_index_nulls_order_before_15_5 test.

Test Scenarios Covered

• Use case based -

• Boundary conditions -

• Arbitrary inputs -

• Negative test cases -

• Minor version upgrade tests -

• Major version upgrade tests -

• Performance tests -

• Tooling impact -

• Client tests -

Check List

• Commits are signed per the DCO using --signoff

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[coveralls]

Pull Request Test Coverage Report for Build 12680442480

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.002%) to 74.922%

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Files with Coverage Reduction	New Missed Lines	%
contrib/babelfishpg_tds/src/backend/tds/tdscomm.c	2	76.03%

Totals
Change from base Build 12669927930:	-0.002%
Covered Lines:	46905
Relevant Lines:	62605

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💛 - Coveralls