Fixed an issue where firestore:delete would not use the emulator when it should

[joehan]

Description

Fixed an issue where firestore:delete would not use the emulator when FIRESTORE_EMULATOR_HOST was set
Fixes #6537

[codecov-commenter]

Codecov Report

❌ Patch coverage is 46.66667% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.31%. Comparing base (b513b0d) to head (9cd210f).
⚠️ Report is 1232 commits behind head on master.

Files with missing lines	Patch %	Lines
src/gcp/firestore.ts	42.85%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6772      +/-   ##
==========================================
- Coverage   54.32%   54.31%   -0.01%     
==========================================
  Files         350      350              
  Lines       24288    24296       +8     
  Branches     5021     5028       +7     
==========================================
+ Hits        13194    13196       +2     
- Misses       9888     9894       +6     
  Partials     1206     1206              

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[Pickachu]

Thanks for PR team!