Fix backoff multiplier in the tx retries

[vtleonardo]

Scope

The multiplier between retries during some edge cases on the transaction watcher should wait for the first retry to be applied. This PR also fixes a small bug where the correct polling time was not being applied to the watcher backend.

[codecov-commenter]

Codecov Report

Merging #64 (e7af66b) into main (dff6b0e) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main      #64      +/-   ##
==========================================
- Coverage   45.65%   45.64%   -0.01%     
==========================================
  Files         214      214              
  Lines       38484    38488       +4     
==========================================
- Hits        17569    17568       -1     
- Misses      18988    18990       +2     
- Partials     1927     1930       +3     

Impacted Files	Coverage Δ
layer1/transaction/backend.go	0.86% <0.00%> (ø)
layer1/transaction/worker_pool.go	0.00% <0.00%> (ø)
peering/active.go	83.01% <0.00%> (-0.95%)	⬇️
badgerTrie/smt_merkle_proof.go	64.84% <0.00%> (ø)

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[ghost]

Looks good!