DEV: Remove enable_experimental_image_uploader site setting (#14691)

DEV: Remove enable_experimental_image_uploader site setting (#14691)

This setting was already removed in the UI and the DB in 2364626dedc82b0ff3086407f68705cff22c2849, but I forgot to remove the actual setting from yml.

diff --git a/config/site_settings.yml b/config/site_settings.yml
index 107c4b9..e78f38f 100644
--- a/config/site_settings.yml
+++ b/config/site_settings.yml
@@ -267,10 +267,6 @@ basic:
     client: true
     default: true
     hidden: true
-  enable_experimental_image_uploader:
-    client: true
-    default: false
-    hidden: true
   enable_experimental_composer_uploader:
     client: true
     default: false

GitHub sha: fffbb6960689f50e9b16d5ddbeef38bb15f4a8ed

This commit appears in #14691 which was approved by featheredtoast. It was merged by martin.