refactor(icon): remove addition style

The `stroke-width: 32px` line never applies because of the following line where we apply the CSS Variable. All versions of browsers that Ionicons supports also support CSS Variables, so the `stroke-width: 32px` line isn't needed anymore.

src/components/icon/icon.css

@@ -21,7 +21,6 @@
 }
 
 .ionicon-stroke-width {
-  stroke-width: 32px;
   stroke-width: var(--ionicon-stroke-width, 32px);
 }