fix: saved backlogs are not reloaded at startup on non-preload mode

[mmta]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 95.86%. Comparing base (b9dd8d2) to head (085d87a).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #54      +/-   ##
==========================================
+ Coverage   95.84%   95.86%   +0.02%     
==========================================
  Files          32       32              
  Lines        6083     6142      +59     
==========================================
+ Hits         5830     5888      +58     
- Misses        253      254       +1     

Flag	Coverage Δ
unittests	95.86% <88.88%> (+0.02%)	⬆️

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

Files	Coverage Δ
server/src/manager/option.rs	100.00% <100.00%> (ø)
server/src/backlog/manager/storage.rs	96.49% <90.47%> (-3.51%)	⬇️
server/src/backlog/manager.rs	87.39% <61.53%> (ø)
server/src/manager.rs	95.19% <93.15%> (-0.01%)	⬇️

... and 1 file with indirect coverage changes