fix(nodebuilder/pruner): Change archival mode warning message

[renaynay]

Change archival mode warning message.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 44.90%. Comparing base (2469e7a) to head (49438e1).
Report is 431 commits behind head on main.

Files with missing lines	Patch %	Lines
nodebuilder/pruner/flags.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4064      +/-   ##
==========================================
+ Coverage   44.83%   44.90%   +0.07%     
==========================================
  Files         265      308      +43     
  Lines       14620    22481    +7861     
==========================================
+ Hits         6555    10096    +3541     
- Misses       7313    11302    +3989     
- Partials      752     1083     +331     

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