chore(dart/_util-fns): make adjustTsExamplePath4Dart idempotent (#1515)
chore(dart/_util-fns): make adjustTsExamplePath4Dart idempotent (#1515)

Fixes #1513.
angular/angular-cn,Adam-Meisen/angular.io,Urigo/angular.io,Adam-Meisen/angular.io,GuzmanPI/angular-es,angular/angular.io,realappie/angular.io,juleskremer/angular.io,rsreimer/angular.io,angular/angular-es,Adam-Meisen/angular.io,naomiblack/angular.io,angular/angular-fr,GuzmanPI/angular-es,SaloGala/angular-es,rsreimer/angular.io,juleskremer/angular.io,rsreimer/angular.io,realappie/angular.io,NoahLuftYang/angular-ko,angular/angular.io,Urigo/angular.io,Urigo/angular.io,IdeaBlade/angular.io,ziarti/angular-fr,kwalrath/angular.io,angular/angular-cn,angular/angular-es,IdeaBlade/angular.io,ziarti/angular-fr,SaloGala/angular-es,juleskremer/angular.io,gyujincho/angular-ko,gyujincho/angular-ko,Urigo/angular.io,angular-live/angular.io,slm-sum/angular-ja,SaloGala/angular-es,patou/angular-fr,angular/angular-ko,angular/angular-ko,rsreimer/angular.io,Adam-Meisen/angular.io,naomiblack/angular.io,chalin/angular.io,patou/angular-fr,IdeaBlade/angular.io,juleskremer/angular.io,angular/angular-cn,chalin/angular.io,NoahLuftYang/angular-ko,patou/angular-fr,chalin/angular.io,gyujincho/angular-ko,angular/angular-cn,kwalrath/angular.io,ziarti/angular-fr,angular/angular-ko,angular/angular-fr,NoahLuftYang/angular-ko,juleskremer/angular.io,angular/angular-fr,kwalrath/angular.io,naomiblack/angular.io,slm-sum/angular-ja,onyoon7/angular-ko,tonygoussot/angular-fr,naomiblack/angular.io,ziarti/angular-fr,slm-sum/angular-ja,SaloGala/angular-es,kwalrath/angular.io,rsreimer/angular.io,tonygoussot/angular-fr,angular/angular-cn,onyoon7/angular-ko,naomiblack/angular.io,gyujincho/angular-ko,ziarti/angular-fr,GuzmanPI/angular-es,angular/angular.io,tonygoussot/angular-fr,angular/angular-es,NoahLuftYang/angular-ko,GuzmanPI/angular-es,angular-live/angular.io,NoahLuftYang/angular-ko,angular-live/angular.io,tonygoussot/angular-fr,chalin/angular.io,realappie/angular.io,onyoon7/angular-ko,onyoon7/angular-ko,patou/angular-fr,slm-sum/angular-ja,Urigo/angular.io,patou/angular-fr,angular/angular-fr,onyoon7/angular-ko,SaloGala/angular-es,angular-live/angular.io,realappie/angular.io,gyujincho/angular-ko,realappie/angular.io,tonygoussot/angular-fr,angular/angular-es,angular/angular-fr,slm-sum/angular-ja,angular/angular-ko,kwalrath/angular.io,IdeaBlade/angular.io,angular/angular.io,angular/angular-es,IdeaBlade/angular.io,GuzmanPI/angular-es,chalin/angular.io,Adam-Meisen/angular.io,angular/angular-ko,angular/angular.io