Fix menu rendering issue for some menu layouts.

src/scss/button.scss

@@ -7,4 +7,5 @@ ha-icon-button.button {
   --ha-icon-display: block;
   /* Buttons can always be clicked */
   pointer-events: auto;
+  opacity: 0.9;
 }

src/scss/menu.scss

@@ -4,7 +4,6 @@
   --frigate-card-menu-button-size: 40px;
   --mdc-icon-button-size: var(--frigate-card-menu-button-size);
   --mdc-icon-size: calc(var(--mdc-icon-button-size) / 2);
-  opacity: 0.9;
  }
 
 .frigate-card-menu {