[ContextualSaveBar] Remove unneeded Button color overrides

Author: chloerice

polaris-react/src/components/Frame/components/ContextualSaveBar/ContextualSaveBar.scss

@@ -1,12 +1,6 @@
 @import '../../../../styles/common';
 
 .ContextualSaveBar {
-  /* stylelint-disable -- polaris: Used to apply dark theme to action buttons */
-  --p-color-bg: var(--p-color-bg-inverse);
-  --p-color-text: var(--p-color-text-inverse);
-  --p-color-bg-hover: var(--p-color-bg-inverse-hover);
-  --p-color-bg-subdued-active: var(--p-color-bg-inverse-active);
-  /* stylelint-enable */
   display: flex;
   height: $top-bar-height;
   background: var(--p-color-bg-inverse);