fix(ADA-2810): Remove seekbar styling on chapters (#1077)

### Description of the Changes

Please add a detailed description of the change, whether it's an
enhancement or a bugfix.
If the PR is related to an open issue please link to it.

**Issue:**

**Fix:**

#### Resolves FEC-[Please add the ticket reference here]

Author: valentinStoicaK

src/components/seekbar/_seekbar.scss

@@ -38,6 +38,7 @@
       transform 200ms ease;
     &.chapters {
       background-color: transparent;
+      border: none;
       .virtual-progress-indicator {
         height: 8px;
         transform: translateY(-2px);