Clean-up Instruction::update_branch_offset extension method

[Robbepop]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 80.30303% with 26 lines in your changes missing coverage. Please review.

Project coverage is 81.66%. Comparing base (66075b9) to head (2192f9b).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...rates/wasmi/src/engine/translator/instr_encoder.rs	72.22%	25 Missing ⚠️
crates/wasmi/src/engine/translator/comparator.rs	97.61%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1230      +/-   ##
==========================================
+ Coverage   81.64%   81.66%   +0.02%     
==========================================
  Files         304      304              
  Lines       25111    25170      +59     
==========================================
+ Hits        20501    20555      +54     
- Misses       4610     4615       +5     

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