[develop]: Use threshold parameter in observer of slider tabs.

sharedComponents/tabs/slider-tabs.component.ts

@@ -233,7 +233,7 @@ export class SliderTabsComponent implements AfterViewInit, OnDestroy {
           }, 200);
         }
       });
-    }, {threshold: 0.1});
+    }, {threshold: this.scrollThreshold});
     this.tabs.forEach(tab => {
       let element = document.getElementById(tab.id.toString());
       if (element) {