Timeline: Fix a bug where local echoes were showing unencrypted shields.

[pixlwave]

Small fix following on from #3783 as local echoes were always showing as SentInClear due to the encryption_info not being available.

Will need a rebase after #3786 to add the code field (or vice versa).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.03%. Comparing base (bfa069d) to head (dca9849).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3788      +/-   ##
==========================================
+ Coverage   84.02%   84.03%   +0.01%     
==========================================
  Files         259      259              
  Lines       27159    27159              
==========================================
+ Hits        22819    22824       +5     
+ Misses       4340     4335       -5     

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