Revert "Switch DSN to point to sandbox mirror" [ONLY MERGE IF DEMO BROKEN]

[maxkosty]

This reverts commit 3c62da0.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.756%. Comparing base (3c62da0) to head (08fcae2).

Additional details and impacted files

@@                     Coverage Diff                     @@
##           sandbox-mirror-switch      #103       +/-   ##
===========================================================
+ Coverage                 36.000%   37.756%   +1.756%     
===========================================================
  Files                         10        10               
  Lines                       1025      1025               
  Branches                     323       323               
===========================================================
+ Hits                         369       387       +18     
+ Misses                       648       629       -19     
- Partials                       8         9        +1     

Files with missing lines	Coverage Δ
EmpowerPlant/AppDelegate.swift	64.367% <100.000%> (ø)

... and 1 file with indirect coverage changes

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