fix: do not modify options object, use defaultScopes

[alexander-fenster]

Regenerated the library using
gapic-generator-typescript
v1.2.1.

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[codecov]

Codecov Report

Merging #419 (46d7ffd) into master (9a82345) will decrease coverage by 0.04%.
The diff coverage is 96.39%.

@@            Coverage Diff             @@
##           master     #419      +/-   ##
==========================================
- Coverage   96.96%   96.92%   -0.05%     
==========================================
  Files          15       15              
  Lines        5841     5946     +105     
  Branches      273      255      -18     
==========================================
+ Hits         5664     5763      +99     
- Misses        171      177       +6     
  Partials        6        6              

Impacted Files	Coverage Δ
src/v1beta1/asset_service_client.ts	96.29% <94.82%> (-0.08%)	⬇️
src/v1p4beta1/asset_service_client.ts	96.06% <94.82%> (-0.08%)	⬇️
src/v1p2beta1/asset_service_client.ts	96.96% <95.08%> (-0.04%)	⬇️
src/v1p5beta1/asset_service_client.ts	95.25% <95.38%> (-0.16%)	⬇️
src/v1p1beta1/asset_service_client.ts	96.28% <96.80%> (-0.11%)	⬇️
src/v1/asset_service_client.ts	98.70% <98.15%> (-0.02%)	⬇️

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