strip trailing slash in "use another server" URL

[wunter8]

fixes #428

[codecov-commenter]

Codecov Report

Base: 66.10% // Head: 66.10% // No change to project coverage 👍

Coverage data is based on head (dd689fd) compared to base (cbc912d).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #432   +/-   ##
=======================================
  Coverage   66.10%   66.10%           
=======================================
  Files          35       35           
  Lines        3720     3720           
=======================================
  Hits         2459     2459           
  Misses        908      908           
  Partials      353      353           

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