fix(slider): fix slider focus ring inheritance weakness

PiperOrigin-RevId: 539101383

Author: Elliott Marquez

slider/lib/_slider.scss

@@ -93,6 +93,13 @@ $_md-sys-shape: tokens.md-sys-shape-values();
         shadow-color: var(--_handle-shadow-color),
       )
     );
+    // Focus ring
+    @include focus-ring.theme(
+      (
+        'outward-offset': -2px,
+        shape: 9999px,
+      )
+    );
   }
 
   md-elevation {
@@ -449,15 +456,6 @@ $_md-sys-shape: tokens.md-sys-shape-values();
     z-index: 1;
   }
 
-  // Focus ring
-  md-focus-ring {
-    @include focus-ring.theme(
-      (
-        'outward-offset': -2px,
-      )
-    );
-  }
-
   // Ripple
   .handle {
     @include ripple.theme(