[instance] Provide non-vararg arity for update-original-and-current

[alexander-yakushev]

The function toucan2.instance/update-original-and-current appears to be frequently invoked inside toucan2.tools.transformed/apply-result-row-transform. The call chain involves passing args with apply in multiple functions, which generates redundant garbage (redundant because apply-result-row-transform doesn't pass any args, just f).

The PR adds an explicit f-only arity to functions in the call chain.

[codecov]

Codecov Report

Attention: Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.20%. Comparing base (e14a45e) to head (952cf41).

Files with missing lines	Patch %	Lines
src/toucan2/instance.clj	95.23%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #181      +/-   ##
==========================================
- Coverage   83.23%   83.20%   -0.04%     
==========================================
  Files          37       37              
  Lines        2511     2524      +13     
  Branches      215      214       -1     
==========================================
+ Hits         2090     2100      +10     
- Misses        206      210       +4     
+ Partials      215      214       -1     

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