[clarity-wasm] fix function context rollback

[csgui]

This change needs to be reverted, as it adds an additional call to global_context.rollback(), which in turn disrupts the function call context.

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 21.40%. Comparing base (396a0da) to head (b299de5).
Report is 4 commits behind head on feat/clarity-wasm-develop.

Files with missing lines	Patch %	Lines
clarity/src/vm/clarity_wasm.rs	60.00%	2 Missing ⚠️

❌ Your project status has failed because the head coverage (21.40%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@                      Coverage Diff                      @@
##           feat/clarity-wasm-develop    #6277      +/-   ##
=============================================================
+ Coverage                      21.39%   21.40%   +0.01%     
=============================================================
  Files                            526      526              
  Lines                         339890   339879      -11     
  Branches                         323      323              
=============================================================
+ Hits                           72728    72763      +35     
+ Misses                        267154   267108      -46     
  Partials                           8        8              

Files with missing lines	Coverage Δ
clarity/src/vm/clarity_wasm.rs	33.51% <60.00%> (+0.05%)	⬆️

... and 27 files with indirect coverage changes

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