fix(gen): use named key in QueryParameterObjectField

[taxio]

The code generated for uri.QueryParameterObjectField currently lacks field keys, leading to go vet flagging errors as shown below:

$ go vet ./...
# github.com/ogen-go/ogen/internal/integration/test_form
internal/integration/test_form/oas_request_decoders_gen.go:455:46: github.com/ogen-go/ogen/uri.QueryParameterObjectField struct literal uses unkeyed fields
internal/integration/test_form/oas_request_decoders_gen.go:455:62: github.com/ogen-go/ogen/uri.QueryParameterObjectField struct literal uses unkeyed fields
internal/integration/test_form/oas_request_decoders_gen.go:477:46: github.com/ogen-go/ogen/uri.QueryParameterObjectField struct literal uses unkeyed fields
internal/integration/test_form/oas_request_decoders_gen.go:477:62: github.com/ogen-go/ogen/uri.QueryParameterObjectField struct literal uses unkeyed fields
internal/integration/test_form/oas_request_decoders_gen.go:700:46: github.com/ogen-go/ogen/uri.QueryParameterObjectField struct literal uses unkeyed fields
internal/integration/test_form/oas_request_decoders_gen.go:700:62: github.com/ogen-go/ogen/uri.QueryParameterObjectField struct literal uses unkeyed fields
# github.com/ogen-go/ogen/internal/integration/test_parameters
internal/integration/test_parameters/oas_parameters_gen.go:674:45: github.com/ogen-go/ogen/uri.QueryParameterObjectField struct literal uses unkeyed fields
internal/integration/test_parameters/oas_parameters_gen.go:674:60: github.com/ogen-go/ogen/uri.QueryParameterObjectField struct literal uses unkeyed fields
internal/integration/test_parameters/oas_parameters_gen.go:674:75: github.com/ogen-go/ogen/uri.QueryParameterObjectField struct literal uses unkeyed fields
internal/integration/test_parameters/oas_parameters_gen.go:705:45: github.com/ogen-go/ogen/uri.QueryParameterObjectField struct literal uses unkeyed fields
internal/integration/test_parameters/oas_parameters_gen.go:705:60: github.com/ogen-go/ogen/uri.QueryParameterObjectField struct literal uses unkeyed fields
internal/integration/test_parameters/oas_parameters_gen.go:705:75: github.com/ogen-go/ogen/uri.QueryParameterObjectField struct literal uses unkeyed fields

While the linter settings for this repository do not trigger any errors, the linter in each ogen user's project does inspect the generated code. Therefore, we want to ensure at a minimum that the code passes go vet.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.84%. Comparing base (adbac42) to head (a89c573).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1208      +/-   ##
==========================================
+ Coverage   73.82%   73.84%   +0.01%     
==========================================
  Files         188      188              
  Lines       12693    12693              
==========================================
+ Hits         9371     9373       +2     
+ Misses       2787     2786       -1     
+ Partials      535      534       -1     

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