fix(material-experimental/slide-toggle): redefine more variables (#18908)

Author: andrewseguin

src/material-experimental/mdc-slide-toggle/_slide-toggle-theme.scss

@@ -13,9 +13,17 @@
   // Save original values of MDC global variables. We need to save these so we can restore the
   // variables to their original values and prevent unintended side effects from using this mixin.
   $orig-mdc-switch-baseline-theme-color: $mdc-switch-baseline-theme-color;
+  $orig-mdc-switch-toggled-off-thumb-color: $mdc-switch-toggled-off-thumb-color;
+  $orig-mdc-switch-toggled-off-track-color: $mdc-switch-toggled-off-track-color;
+  $orig-mdc-switch-disabled-thumb-color: $mdc-switch-disabled-thumb-color;
+  $orig-mdc-switch-disabled-track-color: $mdc-switch-disabled-track-color;
 
   @include mat-using-mdc-theme($theme) {
     $mdc-switch-baseline-theme-color: primary !global;
+    $mdc-switch-toggled-off-thumb-color: mdc-theme-prop-value(surface) !global;
+    $mdc-switch-toggled-off-track-color: mdc-theme-prop-value(on-surface) !global;
+    $mdc-switch-disabled-thumb-color: mdc-theme-prop-value(surface) !global;
+    $mdc-switch-disabled-track-color: mdc-theme-prop-value(on-surface) !global;
 
     @include mdc-form-field-core-styles($query: $mat-theme-styles-query);
 
@@ -63,6 +71,10 @@
 
   // Restore original values of MDC global variables.
   $mdc-switch-baseline-theme-color: $orig-mdc-switch-baseline-theme-color !global;
+  $mdc-switch-toggled-off-thumb-color: $orig-mdc-switch-toggled-off-thumb-color !global;
+  $mdc-switch-toggled-off-track-color: $orig-mdc-switch-toggled-off-track-color !global;
+  $mdc-switch-disabled-thumb-color: $orig-mdc-switch-disabled-thumb-color !global;
+  $mdc-switch-disabled-track-color: $orig-mdc-switch-disabled-track-color !global;
 }
 
 @mixin mat-mdc-slide-toggle-typography($config) {