fix: #4518 MC SQL to correctly parse ndjson files with extension .ndjson

[jiuker]

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Description

fix #4518

Motivation and Context

How to test this PR?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Optimization (provides speedup with no functional changes)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• Fixes a regression (If yes, please add commit-id or PR # here)
• Unit tests added/updated
• Internal documentation updated
• Create a documentation update request here

[jiuker]

@klauspost cc

[shtripat]

LGTM. Verified.
If loaded the object with --attr="content-type=application/json" the output works fine for mc sql --recursive --query="select * from s3object" myminio/test-bucket --json-input type=lines