ISTWCMS-4626: Remove eu_cookie_compliance color config

This removes the unused eu_cookie_compliance styling. Styling is done
with our other stylesheets.

config/install/eu_cookie_compliance.settings.yml

@@ -13,7 +13,7 @@ popup_agreed:
   format: uw_tf_standard
 popup_agree_button_message: 'Accept all'
 popup_agreed_enabled: false
-popup_bg_hex: 'fdd54f'
+popup_bg_hex: ''
 popup_clicking_confirmation: true
 popup_scrolling_confirmation: false
 popup_delay: 1000
@@ -36,7 +36,7 @@ popup_link: '<front>'
 popup_link_new_window: true
 popup_position: false
 fixed_top_position: true
-popup_text_hex: '000000'
+popup_text_hex: ''
 popup_width: 100%
 use_bare_css: true
 disagree_do_not_show_popup: false