Update hover and focus selectors for Move to Trash to ensure they're …

…always red (#19974)

- Updates the selectors in .editor-post-trash to use similar
  specificity as .components-button.is-link for the hover
  and focus states to ensure that they are always red.

packages/editor/src/components/post-trash/style.scss

@@ -3,8 +3,8 @@
 	border-color: darken($alert-red, 15%);
 	justify-content: center;
 
-	&:hover,
-	&:focus {
+	&:not(:disabled):not([aria-disabled="true"]):hover,
+	&:not([aria-disabled="true"]):focus {
 		color: darken($alert-red, 20%);
 		border-color: darken($alert-red, 20%);
 	}