[backport] fix fallback to poet pow

[poszu]

Backports #6197

[codecov]

Codecov Report

Attention: Patch coverage is 62.06897% with 11 lines in your changes missing coverage. Please review.

Project coverage is 81.7%. Comparing base (e64a1dc) to head (88813a3).
Report is 9 commits behind head on v1.6.

Files	Patch %	Lines
activation/certifier.go	40.0%	3 Missing and 3 partials ⚠️
activation/poet.go	70.0%	2 Missing and 1 partial ⚠️
sql/localsql/certifier/db.go	77.7%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            v1.6   #6202     +/-   ##
=======================================
+ Coverage   81.6%   81.7%   +0.1%     
=======================================
  Files        301     301             
  Lines      32323   32331      +8     
=======================================
+ Hits       26389   26443     +54     
+ Misses      4214    4171     -43     
+ Partials    1720    1717      -3     

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