fix: marshalled session state

[kelkarajay]

• Use .isActive() eval for state

Related issue(s)

Checklist

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• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
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[codecov]

Codecov Report

Merging #2901 (a98f0d1) into master (56feb07) will decrease coverage by 0.03%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           master    #2901      +/-   ##
==========================================
- Coverage   76.11%   76.08%   -0.04%     
==========================================
  Files         308      308              
  Lines       18873    18880       +7     
==========================================
- Hits        14366    14364       -2     
- Misses       3389     3397       +8     
- Partials     1118     1119       +1     

Impacted Files	Coverage Δ
session/session.go	76.98% <71.42%> (-0.33%)	⬇️
cmd/courier/watch.go	63.01% <0.00%> (-9.59%)	⬇️

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