fix(control_validator): fix error msg

[kyoichi-sugahara]

Description

🤖 Generated by Copilot at ebf5295

Updated the warning message in control_validator.cpp to match the validation logic. This change enhances the user experience and avoids confusion.

Tests performed

Not applicable.

Effects on system behavior

Not applicable.

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01% ⚠️

Comparison is base (7a4a905) 15.11% compared to head (ebf5295) 15.11%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4794      +/-   ##
==========================================
- Coverage   15.11%   15.11%   -0.01%     
==========================================
  Files        1568     1568              
  Lines      108176   108177       +1     
  Branches    33218    33218              
==========================================
  Hits        16346    16346              
- Misses      74013    74014       +1     
  Partials    17817    17817              

Flag	Coverage Δ		*Carryforward flag
differential	0.00% <0.00%> (?)
total	15.11% <ø> (+<0.01%)	⬆️	Carriedforward from 7a4a905

*This pull request uses carry forward flags. Click here to find out more.

Files Changed	Coverage Δ
...ontrol/control_validator/src/control_validator.cpp	0.00% <0.00%> (ø)

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