fixup! refactor(material/button): switch flat-button to density tokens

Author: wagnermaciel

src/material/core/tokens/m2/mdc/_button-filled.scss

@@ -16,6 +16,7 @@ $prefix: (mdc, button-filled);
 // our CSS.
 @function get-unthemable-tokens() {
   @return (
+    container-shape: 4px,
     container-elevation: 0,
     disabled-container-elevation: 0,
     focus-container-elevation: 0,
@@ -89,8 +90,7 @@ $prefix: (mdc, button-filled);
           -3: 24px,
         ),
         $scale
-      ),
-    container-shape: 4px
+      )
   );
 }