Bitcoin syncer: Unblock event loop

[TheCharlatan]

No description provided.

[codecov-commenter]

Codecov Report

Merging #388 (6bb5ad7) into main (44fdc6f) will decrease coverage by 0.0%.
The diff coverage is 0.0%.

@@           Coverage Diff           @@
##            main    #388     +/-   ##
=======================================
- Coverage   13.6%   13.6%   -0.0%     
=======================================
  Files         27      27             
  Lines       7507    7550     +43     
=======================================
+ Hits        1024    1028      +4     
- Misses      6483    6522     +39     

Impacted Files	Coverage Δ
src/syncerd/bitcoin_syncer.rs	0.0% <0.0%> (ø)
src/syncerd/syncer_state.rs	90.7% <0.0%> (-0.1%)	⬇️
src/lib.rs	12.0% <0.0%> (-0.1%)	⬇️
src/syncerd/monero_syncer.rs	0.0% <0.0%> (ø)

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