fix(core): remove isPositive validation decorators

[TimoGlastra]

Assumption was that isPositive would check for >= 0, but not negative,
but in reality it checks for >= 1

Signed-off-by: Timo Glastra timo@animo.id

[codecov-commenter]

Codecov Report

Merging #477 (b12b4ad) into main (cb256ca) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #477   +/-   ##
=======================================
  Coverage   85.75%   85.75%           
=======================================
  Files         254      254           
  Lines        5516     5516           
  Branches      892      892           
=======================================
  Hits         4730     4730           
  Misses        785      785           
  Partials        1        1           

Impacted Files	Coverage Δ
...ages/core/src/decorators/thread/ThreadDecorator.ts	100.00% <100.00%> (ø)
...s/core/src/modules/proofs/models/ProofAttribute.ts	72.72% <100.00%> (ø)
...re/src/modules/proofs/models/RequestedAttribute.ts	100.00% <100.00%> (ø)
...re/src/modules/proofs/models/RequestedPredicate.ts	100.00% <100.00%> (ø)
...src/modules/routing/messages/BatchPickupMessage.ts	58.33% <100.00%> (ø)

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