make sure to give MEMBER OF the correct precedence

[systay]

Description

The precedence rules for MEMBER OF were not correct, leading to incorrect queries being sent down to the underlying MySQL instances.

Related Issue(s)

Fixes #18238

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
• If this change is to be back-ported to previous releases, a justification is included in the PR description
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

[vitess-bot]

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[systay]

I would like to backport this since it leads to invalid results, and it's a relatively safe thing to backport

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.45%. Comparing base (421aca0) to head (0564713).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18237      +/-   ##
==========================================
- Coverage   67.47%   67.45%   -0.02%     
==========================================
  Files        1602     1602              
  Lines      262191   262189       -2     
==========================================
- Hits       176907   176869      -38     
- Misses      85284    85320      +36     

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[dbussink]

Stray newline :).