fix: do not modify options object, use defaultScopes

[alexander-fenster]

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

[alexander-fenster]

This is weird:

@skuruppu Do you have any idea what may be causing this difference?

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[codecov]

Codecov Report

Merging #1264 (1a076e1) into master (3c17b44) will decrease coverage by 0.03%.
The diff coverage is 98.39%.

@@            Coverage Diff             @@
##           master    #1264      +/-   ##
==========================================
- Coverage   98.62%   98.59%   -0.04%     
==========================================
  Files          23       23              
  Lines       21426    21609     +183     
  Branches     1215     1084     -131     
==========================================
+ Hits        21132    21306     +174     
- Misses        291      294       +3     
- Partials        3        9       +6     

Impacted Files	Coverage Δ
src/v1/spanner_client.ts	99.27% <97.81%> (-0.12%)	⬇️
src/v1/instance_admin_client.ts	99.17% <98.10%> (-0.14%)	⬇️
src/v1/database_admin_client.ts	99.51% <98.87%> (-0.09%)	⬇️

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