[fenix] For https://github.com/mozilla-mobile/fenix/issues/21973 - Remove @color/onboarding_illustration_selected_dark_theme redirection

app/src/main/res/values-night/colors.xml

@@ -38,7 +38,7 @@
     <color name="swipe_delete_background_normal_theme">@color/swipe_delete_background_dark_theme</color>
     <color name="onboarding_card_background_start_gradient_normal_theme">@color/accent_bright_dark_theme</color>
     <color name="onboarding_card_background_end_gradient_normal_theme">@color/accent_high_contrast_dark_theme</color>
-    <color name="onboarding_illustration_selected_normal_theme">@color/onboarding_illustration_selected_dark_theme</color>
+    <color name="onboarding_illustration_selected_normal_theme">@color/accent_dark_theme</color>
     <color name="onboarding_illustration_deselected_normal_theme">@color/onboarding_illustration_deselected_dark_theme</color>
     <color name="add_on_private_browsing_exterior_circle_background_normal_theme">@color/add_on_private_browsing_exterior_circle_background_dark_theme</color>
     <color name="add_on_private_browsing_interior_icon_background_normal_theme">@color/add_on_private_browsing_interior_icon_background_dark_theme</color>

app/src/main/res/values/colors.xml

@@ -37,7 +37,6 @@
     <color name="sync_disconnected_icon_fill_dark_theme">#FFF36E</color>
     <color name="sync_disconnected_background_dark_theme">#5B5846</color>
     <color name="swipe_delete_background_dark_theme">@color/photonDarkGrey20</color>
-    <color name="onboarding_illustration_selected_dark_theme">@color/accent_dark_theme</color>
     <color name="onboarding_illustration_deselected_dark_theme">#99FBFBFE</color>
     <color name="add_on_private_browsing_exterior_circle_background_dark_theme">@color/accent_dark_theme</color>
     <color name="add_on_private_browsing_interior_icon_background_dark_theme">@color/photonWhite</color>