fix: head exchange

[D4ryl00]

When a peer has just been connected and has a head list ahead, it cannot exchange its head list with other already connected peers.

Fix

• [x] sent head list is empty
• [x] received head list event is lost

[codecov[bot]]

Codecov Report

Merging #87 (ae96707) into master (eefbdde) will increase coverage by 0.27%. The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
+ Coverage   63.10%   63.37%   +0.27%     
==========================================
  Files          31       31              
  Lines        2290     2318      +28     
==========================================
+ Hits         1445     1469      +24     
- Misses        601      604       +3     
- Partials      244      245       +1     

Flag	Coverage Δ
unittests	63.37% <83.33%> (+0.27%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
baseorbitdb/orbitdb.go	68.85% <55.55%> (-0.30%)	:arrow_down:
pubsub/directchannel/channel.go	71.01% <66.66%> (-0.42%)	:arrow_down:
events/events.go	85.13% <100.00%> (-0.06%)	:arrow_down:
stores/basestore/base_store.go	64.72% <0.00%> (+0.76%)	:arrow_up:

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[github-actions[bot]]

:tada: This PR is included in version 1.14.1 :tada:

The release is available on GitHub release

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