Change exclamation point color on collaborative edit warning

## Purpose - Update color for exclamation icon for collaborative edit warning in draft registrations ## Summary of Changes - Add style to change color for exclamation icon to change-caution-color

Author: futa-ikeda

lib/registries/addon/drafts/draft/styles.scss

@@ -74,6 +74,10 @@
  display: flex;
  flex-direction: column;
  align-items: start;
+
+ & i {
+ color: $brand-warning;
+ }
 }
 
 .BackButton {