fix: do not modify options object, use defaultScopes

[alexander-fenster]

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

[codecov]

Codecov Report

Merging #845 (01b40c0) into master (7c79c2d) will decrease coverage by 0.06%.
The diff coverage is 97.72%.

@@            Coverage Diff             @@
##           master     #845      +/-   ##
==========================================
- Coverage   98.48%   98.41%   -0.07%     
==========================================
  Files          17       17              
  Lines       14234    14536     +302     
  Branches      590      563      -27     
==========================================
+ Hits        14018    14306     +288     
- Misses        211      222      +11     
- Partials        5        8       +3     

Impacted Files	Coverage Δ
src/v1p1beta1/image_annotator_client.ts	95.88% <92.30%> (-0.72%)	⬇️
src/v1p2beta1/image_annotator_client.ts	96.37% <94.82%> (-0.09%)	⬇️
src/v1p3beta1/image_annotator_client.ts	97.28% <94.91%> (-0.35%)	⬇️
src/v1/image_annotator_client.ts	98.01% <96.25%> (-0.23%)	⬇️
src/v1p4beta1/image_annotator_client.ts	97.88% <96.34%> (-0.05%)	⬇️
src/v1p3beta1/product_search_client.ts	98.84% <98.71%> (-0.01%)	⬇️
src/v1/product_search_client.ts	98.88% <98.80%> (-0.01%)	⬇️
src/v1p4beta1/product_search_client.ts	98.91% <98.80%> (-0.01%)	⬇️
src/index.ts	100.00% <100.00%> (ø)

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