Fix ReloadSchema incorrectly using DisableBinlogs value in grpctmclient

[mhamza15]

Description

Fixes a small bug where ReloadSchema was incorrectly set to req.DisableBinlogs instead of req.ReloadSchema in ExecuteFetchAsDba and ExecuteMultiFetchAsDba.

Related Issue(s)

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
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• Tests were added or are not required
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• Documentation was added or is not required

Deployment Notes

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 69.90%. Comparing base (ffa1e9b) to head (2a6c3cd).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
go/vt/vttablet/grpctmclient/client.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #19085      +/-   ##
==========================================
+ Coverage   69.88%   69.90%   +0.01%     
==========================================
  Files        1612     1612              
  Lines      215822   215826       +4     
==========================================
+ Hits       150828   150866      +38     
+ Misses      64994    64960      -34     

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