#29065: Fix shellcheck SC2006 warnings in test_switch_id.sh

[rl1987]

https://trac.torproject.org/projects/tor/ticket/29065

[coveralls]

Pull Request Test Coverage Report for Build 3817

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1718 unchanged lines in 10 files lost coverage.
• Overall coverage increased (+0.03%) to 61.775%

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Files with Coverage Reduction	New Missed Lines	%
src/feature/hs/hs_client.c	2	51.32%
src/core/or/circuitpadding.c	2	97.27%
src/lib/tls/x509_openssl.c	7	95.21%
src/core/proto/proto_socks.c	11	92.72%
src/feature/dirauth/bwauth.c	18	89.19%
src/lib/crypt_ops/crypto_rsa.c	18	92.49%
src/lib/sandbox/sandbox.c	182	1.6%
src/feature/nodelist/networkstatus.c	333	53.29%
src/feature/dirauth/dirvote.c	523	64.74%
src/app/config/config.c	622	72.5%

Totals
Change from base Build 3737:	0.03%
Covered Lines:	45350
Relevant Lines:	73411

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💛 - Coveralls

[nmathewson]

Squashed and merged.