fix(pricing-table): increasing annotation toggle touch area (#11623)

### Related Ticket(s)

[ADCMS-4432](https://jsw.ibm.com/browse/ADCMS-4432)

### Description

In continuation of [this PR for v1](#11581). I'm raising this one for v2:

In the pricing table, the toggle annotation arrow was too small, making it difficult to be hit on mobile resolutions. I added more padding so it's now easier to be touched.

packages/styles/scss/components/pricing-table/_pricing-table.scss

@@ -338,8 +338,9 @@
     padding-inline-end: $spacing-03;
 
     button {
-      padding: 0;
+      padding: $spacing-05;
       border: none;
+      margin: -$spacing-05;
       background: none;
     }