Treat only true and "true" as true

lib/pleroma/web/common_api/common_api.ex

@@ -102,7 +102,7 @@ def post(user, %{"status" => status} = data) do
              attachments,
              tags,
              get_content_type(data["content_type"]),
-             data["no_attachment_links"]
+             Enum.member?([true, "true"], data["no_attachment_links"])
            ),
          context <- make_context(inReplyTo),
          cw <- data["spoiler_text"],

lib/pleroma/web/common_api/utils.ex

@@ -89,7 +89,7 @@ def make_content_html(
       ) do
     status
     |> format_input(mentions, tags, content_type)
-    |> maybe_add_attachments(attachments, !!no_attachment_links)
+    |> maybe_add_attachments(attachments, no_attachment_links)
   end
 
   def make_context(%Activity{data: %{"context" => context}}), do: context