Bonus fix: set background colour (reference selector)

When in iOS dark mode if the background isn't explicitly set a flash of white appears.

Author: Jordan Hunt

styles/native/js/core/widgets/referenceselector.js

@@ -66,6 +66,7 @@ export const ReferenceSelector = {
         shadowOpacity: 0.2,
         shadowRadius: 10,
         elevation: 16,
+        backgroundColor: input.backgroundColor
     },
     itemContainer: {
         // All ViewStyle properties are allowed

styles/native/ts/core/widgets/referenceselector.ts

@@ -70,6 +70,7 @@ export const ReferenceSelector: DropDownType = {
         shadowOpacity: 0.2,
         shadowRadius: 10,
         elevation: 16,
+        backgroundColor: input.backgroundColor
     },
     itemContainer: {
         // All ViewStyle properties are allowed