fix: SwiftHighlightRules exports

[oykuyilmaz]

Issue #, if available:

#5511

Description of changes:

Exports SwiftHighlightRules according to how we typed it.

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Pull Request Checklist:

• No backwards incompatible changes were made to Ace's public interface which is defined through the main typings file (ace.d.ts) and its references:
  • https://github.com/ajaxorg/ace/blob/master/ace.d.ts
  • https://github.com/ajaxorg/ace/blob/master/ace-modes.d.ts
  • https://github.com/ajaxorg/ace/blob/master/ace-extensions.d.ts

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.57%. Comparing base (099011b) to head (74854c8).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5516   +/-   ##
=======================================
  Coverage   86.56%   86.57%           
=======================================
  Files         588      588           
  Lines       42535    42540    +5     
  Branches     7068     7068           
=======================================
+ Hits        36820    36827    +7     
+ Misses       5715     5713    -2     

Flag	Coverage Δ
unittests	86.57% <100.00%> (+<0.01%)	⬆️

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