Update collection/sites/pastebin.yml

Co-authored-by: rxu <rxu@mail.ru>

Author: iMattPro

collection/sites/pastebin.yml

@@ -7,4 +7,4 @@ iframe:
     width: "100%"
     height: "300"
     style: ["border:none;resize:vertical;width:100%"]
-    src: //pastebin.com/embed_iframe/{@id}?theme=dark
+    src: //pastebin.com/embed_iframe/{@id}{@dark}