fix(packaging): update rollup config to correctly treat rxjs 6 as external

Author: tinesoft

app/templates/_gulpfile.js

@@ -371,25 +371,7 @@ gulp.task('rollup-bundle', (cb) => {
       '@angular/<%= ngModule %>': 'ng.<%= ngModule %>',<% } %>
 
       // Rxjs dependencies
-      'rxjs/Subject': 'Rx',
-      'rxjs/Observable': 'Rx',
-      'rxjs/add/observable/fromEvent': 'Rx.Observable',
-      'rxjs/add/observable/forkJoin': 'Rx.Observable',
-      'rxjs/add/observable/of': 'Rx.Observable',
-      'rxjs/add/observable/merge': 'Rx.Observable',
-      'rxjs/add/observable/throw': 'Rx.Observable',
-      'rxjs/add/operator/auditTime': 'Rx.Observable.prototype',
-      'rxjs/add/operator/toPromise': 'Rx.Observable.prototype',
-      'rxjs/add/operator/map': 'Rx.Observable.prototype',
-      'rxjs/add/operator/filter': 'Rx.Observable.prototype',
-      'rxjs/add/operator/do': 'Rx.Observable.prototype',
-      'rxjs/add/operator/share': 'Rx.Observable.prototype',
-      'rxjs/add/operator/finally': 'Rx.Observable.prototype',
-      'rxjs/add/operator/catch': 'Rx.Observable.prototype',
-      'rxjs/add/observable/empty': 'Rx.Observable.prototype',
-      'rxjs/add/operator/first': 'Rx.Observable.prototype',
-      'rxjs/add/operator/startWith': 'Rx.Observable.prototype',
-      'rxjs/add/operator/switchMap': 'Rx.Observable.prototype'<% if(otherDependencies) {%>,<%}%>
+      'rxjs': 'rxjs'<% if(otherDependencies) {%>,<%}%>
 
       // ATTENTION:
       // Add any other dependency or peer dependency of your library here