fix(code-style): removed double spaces after commas

Author: Victor

src/ngxerror.directive.ts

@@ -1,6 +1,6 @@
 import { Directive, Input, OnInit, OnDestroy, DoCheck, Inject, HostBinding, forwardRef } from '@angular/core';
 
-import { Observable,  Subject,  Subscription, combineLatest } from 'rxjs';
+import { Observable, Subject, Subscription, combineLatest } from 'rxjs';
 
 import { distinctUntilChanged, filter, map } from 'rxjs/operators';