Dark-pink theme: remove white background from configure buttons (#8020)

Before:

<img width="273" height="116" alt="image" src="https://github.com/user-attachments/assets/4fb9b1f2-b960-428e-9c3f-84e803cd0afa" />

After:

<img width="239" height="111" alt="image" src="https://github.com/user-attachments/assets/7528649b-47f0-4111-8cf8-ac54080d5573" />

p/themes/Dark-pink/README.md

@@ -2,7 +2,7 @@
 
 [Dark pink theme](https://gitlab.com/miicat/freshrss-dark-pink-theme) based on **Alternative Dark** theme made by Ghost for [FreshRSS](https://github.com/FreshRSS/FreshRSS)
 
-![screenshot](https://gitlab.com/miicat/freshrss-dark-pink-theme/-/raw/main/Dark-pink/thumbs/original.png)
+![screenshot](./thumbs/original.png)
 
 ## License
 

p/themes/Dark-pink/pinkdark.css

@@ -40,11 +40,6 @@
 	filter: sepia(21%) brightness(94%) hue-rotate(112deg) saturate(1000%) contrast(132%) invert(100%)
 }
 
-.aside_feed .tree-folder-items .item .dropdown-target:target ~ .dropdown-toggle > .icon,
-.aside_feed .tree-folder-items .item.active .dropdown-toggle > .icon {
-	background-color: #000;
-}
-
 #new-article {
 	background: #ffa1af;
 }

p/themes/Dark-pink/pinkdark.rtl.css

@@ -40,11 +40,6 @@
 	filter: sepia(21%) brightness(94%) hue-rotate(112deg) saturate(1000%) contrast(132%) invert(100%)
 }
 
-.aside_feed .tree-folder-items .item .dropdown-target:target ~ .dropdown-toggle > .icon,
-.aside_feed .tree-folder-items .item.active .dropdown-toggle > .icon {
-	background-color: #000;
-}
-
 #new-article {
 	background: #ffa1af;
 }