[Merged by Bors] - fix regression in proposals sync

[dshulyak]

on sync path activeset is downloaded together with proposals so that not updated nodes can download data.
however starting at specific layer (in systests in all layers) we only sign empty activeset, so after downloading proposals it should not pass this validation.

[dshulyak]

bors try

[codecov]

Codecov Report

Merging #4986 (14a6962) into develop (2cb15f9) will decrease coverage by 0.1%.
Report is 1 commits behind head on develop.
The diff coverage is 88.8%.

@@            Coverage Diff            @@
##           develop   #4986     +/-   ##
=========================================
- Coverage     77.1%   77.1%   -0.1%     
=========================================
  Files          254     254             
  Lines        30253   30260      +7     
=========================================
+ Hits         23345   23349      +4     
- Misses        5394    5397      +3     
  Partials      1514    1514             

Files Changed	Coverage Δ
proposals/handler.go	86.2% <88.8%> (+0.2%)	⬆️

... and 2 files with indirect coverage changes

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[bors]

try

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• systest-status

[dshulyak]

bors merge

[bors]

Build failed:

• ci-status

[dshulyak]

bors merge

[bors]

Pull request successfully merged into develop.

Build succeeded!

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