feat: Add UI support for PTZ presets (#1920)

- Closes #1889

Whilst a simple change theoretically, the card has such a collection of
surfaces that can overlap other surfaces, it's challenging to get this
to work right! There's a real chance this will have broken something
z-index related (e.g. X overlaps Y when it should not), or (for related
reasons) broken curver corners on the card.

src/scss/drawer.scss

@@ -9,7 +9,6 @@ div.control-surround {
   position: absolute;
   bottom: 50%;
   transform: translateY(50%);
-  z-index: 0;
   padding-top: $drawer-padding-extend;
   padding-bottom: $drawer-padding-extend;
 }
@@ -48,13 +47,6 @@ advanced-camera-card-icon.control {
   transition: opacity 0.5s ease;
 }
 
-:host([open]) advanced-camera-card-icon.control,
-advanced-camera-card-icon.control:hover {
-  // When the drawer is open or hovered make the button to close it more
-  // prominent.
-  opacity: 1;
-}
-
 :host([location='left']) advanced-camera-card-icon.control {
   border-top-right-radius: $drawer-icon-size;
   border-bottom-right-radius: $drawer-icon-size;