Chore: Fix import of Observable to be from rxjs and not rxjs/internal. It was maybe causing optimization bailouts

bookie/src/app/product/product-list/product-list.component.ts

@@ -3,7 +3,7 @@ import { Component, OnInit } from '@angular/core';
 import { FormBuilder, FormControl, FormGroup } from '@angular/forms';
 import { ActivatedRoute } from '@angular/router';
 import { BehaviorSubject } from 'rxjs';
-import { Observable } from 'rxjs/internal/Observable';
+import { Observable } from 'rxjs';
 import { debounceTime, distinctUntilChanged, startWith } from 'rxjs/operators';
 
 import { MenuCategory } from '../../core/menu-category';