Fix transaction broadcast

[Harrm]

Referenced issues

resolves #1324

Description of the Change

Due to a typo in broadcasting code, messages were not delivered when there were no open outgoing streams to the target peer, which was always the case when broadcasting transactions.

Benefits

Transaction broadcasting works.

Possible Drawbacks

None expected.

Usage Examples or Tests

Alternate Designs

[codecov]

Codecov Report

Merging #1407 (01607c7) into master (2b6d360) will increase coverage by 0.10%.
The diff coverage is 19.30%.

❗ Current head 01607c7 differs from pull request most recent head e234192. Consider uploading reports for the commit e234192 to get more accurate results

@@            Coverage Diff             @@
##           master    #1407      +/-   ##
==========================================
+ Coverage   24.31%   24.41%   +0.10%     
==========================================
  Files         643      639       -4     
  Lines       24260    24132     -128     
  Branches    12577    12518      -59     
==========================================
- Hits         5899     5893       -6     
+ Misses      13096    12983     -113     
+ Partials     5265     5256       -9     

Impacted Files	Coverage Δ
core/api/service/author/impl/author_api_impl.cpp	33.01% <0.00%> (ø)
core/api/service/impl/api_service_impl.cpp	13.33% <0.00%> (-0.14%)	⬇️
core/application/app_configuration.hpp	100.00% <ø> (ø)
core/application/impl/app_configuration_impl.hpp	26.92% <0.00%> (ø)
...onsensus/authority/impl/authority_manager_impl.cpp	21.29% <0.00%> (ø)
core/consensus/babe/impl/block_executor_impl.cpp	23.39% <0.00%> (-0.28%)	⬇️
...nsensus/grandpa/impl/vote_crypto_provider_impl.cpp	0.00% <0.00%> (ø)
core/network/helpers/stream_read_buffer.hpp	0.00% <0.00%> (ø)
core/network/impl/peer_manager_impl.cpp	3.05% <0.00%> (-0.21%)	⬇️
...network/impl/protocols/block_announce_protocol.cpp	0.00% <ø> (ø)
... and 30 more

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