fix(material/snack-bar): use inverse primary for button color

Author: Andrew Seguin

src/material/snack-bar/_m2-snack-bar.scss

@@ -6,25 +6,14 @@
 @function get-tokens($theme) {
   $system: m2-utils.get-system($theme);
 
-  // TODO: Use system colors instead of checking theme type and using primary hues
-  $snack-bar-button-color: map.get($system, inverse-primary);
-  @if (meta.type-of($theme) == map and map.get($theme, color)) {
-    $is-dark: inspection.get-theme-type($theme) == dark;
-    $snack-bar-button-color: if(
-        $is-dark,
-        inspection.get-theme-color($theme, primary, 500),
-        inspection.get-theme-color($theme, primary, 100)
-    );
-  }
-
   @return (
     base: (
       snack-bar-container-shape: 4px,
     ),
     color: (
       snack-bar-container-color: map.get($system, inverse-surface),
       snack-bar-supporting-text-color: map.get($system, inverse-on-surface),
-      snack-bar-button-color: $snack-bar-button-color
+      snack-bar-button-color: map.get($system, inverse-primary)
     ),
     typography: (
       snack-bar-supporting-text-font: map.get($system, body-medium-font),