fix(withLatestFrom): change from hot to cold observable in marble test
fix(withLatestFrom): change from hot to cold observable in marble test

fixes #2526

RxJS-CN/RxJS-Docs-CN,trxcllnt/RxJS,SangKa/RxJS-Docs-CN,kwonoj/RxJS,ReactiveX/RxJS,Brocco/RxJS,ReactiveX/rxjs,ReactiveX/RxJS,kwonoj/RxJS,martinsik/rxjs,kwonoj/RxJS,Brocco/RxJS,ReactiveX/rxjs,trxcllnt/RxJS,benlesh/RxJS,trxcllnt/RxJS,SangKa/RxJS-Docs-CN,IgorMinar/RxJS,RxJS-CN/RxJS-Docs-CN,Brocco/RxJS,IgorMinar/RxJS,jayphelps/rxjs,Brocco/RxJS,ReactiveX/RxJS,benlesh/RxJS,jayphelps/rxjs,benlesh/RxJS,martinsik/rxjs,jayphelps/rxjs,martinsik/rxjs,SangKa/RxJS-Docs-CN,ReactiveX/RxJS,martinsik/rxjs,SangKa/RxJS-Docs-CN,RxJS-CN/RxJS-Docs-CN,jayphelps/rxjs,kwonoj/RxJS,ReactiveX/rxjs,ReactiveX/rxjs,jayphelps/rxjs,benlesh/RxJS,RxJS-CN/RxJS-Docs-CN,trxcllnt/RxJS