Fix embeded relationships in Mastodon API

Currently some endpoints render accounts without for user resulting in
embedded relationship being empty. It causes bugs in followers/following
tab in pleroma-fe but I fixed it for other endpoints as well just in
case

lib/pleroma/web/mastodon_api/mastodon_api_controller.ex

@@ -704,7 +704,7 @@ def upload(%{assigns: %{user: user}} = conn, %{"file" => file} = data) do
     end
   end
 
-  def favourited_by(conn, %{"id" => id}) do
+  def favourited_by(%{assigns: %{user: user}} = conn, %{"id" => id}) do
     with %Activity{data: %{"object" => object}} <- Repo.get(Activity, id),
          %Object{data: %{"likes" => likes}} <- Object.normalize(object) do
       q = from(u in User, where: u.ap_id in ^likes)
@@ -712,13 +712,13 @@ def favourited_by(conn, %{"id" => id}) do
 
       conn
       |> put_view(AccountView)
-      |> render(AccountView, "accounts.json", %{users: users, as: :user})
+      |> render(AccountView, "accounts.json", %{for: user, users: users, as: :user})
     else
       _ -> json(conn, [])
     end
   end
 
-  def reblogged_by(conn, %{"id" => id}) do
+  def reblogged_by(%{assigns: %{user: user}} = conn, %{"id" => id}) do
     with %Activity{data: %{"object" => object}} <- Repo.get(Activity, id),
          %Object{data: %{"announcements" => announces}} <- Object.normalize(object) do
       q = from(u in User, where: u.ap_id in ^announces)
@@ -726,7 +726,7 @@ def reblogged_by(conn, %{"id" => id}) do
 
       conn
       |> put_view(AccountView)
-      |> render("accounts.json", %{users: users, as: :user})
+      |> render("accounts.json", %{for: user, users: users, as: :user})
     else
       _ -> json(conn, [])
     end
@@ -783,7 +783,7 @@ def followers(%{assigns: %{user: for_user}} = conn, %{"id" => id} = params) do
       conn
       |> add_link_headers(:followers, followers, user)
       |> put_view(AccountView)
-      |> render("accounts.json", %{users: followers, as: :user})
+      |> render("accounts.json", %{for: for_user, users: followers, as: :user})
     end
   end
 
@@ -800,7 +800,7 @@ def following(%{assigns: %{user: for_user}} = conn, %{"id" => id} = params) do
       conn
       |> add_link_headers(:following, followers, user)
       |> put_view(AccountView)
-      |> render("accounts.json", %{users: followers, as: :user})
+      |> render("accounts.json", %{for: for_user, users: followers, as: :user})
     end
   end
 
@@ -808,7 +808,7 @@ def follow_requests(%{assigns: %{user: followed}} = conn, _params) do
     with {:ok, follow_requests} <- User.get_follow_requests(followed) do
       conn
       |> put_view(AccountView)
-      |> render("accounts.json", %{users: follow_requests, as: :user})
+      |> render("accounts.json", %{for: followed, users: follow_requests, as: :user})
     end
   end
 
@@ -1235,7 +1235,7 @@ def list_accounts(%{assigns: %{user: user}} = conn, %{"id" => id}) do
          {:ok, users} = Pleroma.List.get_following(list) do
       conn
       |> put_view(AccountView)
-      |> render("accounts.json", %{users: users, as: :user})
+      |> render("accounts.json", %{for: user, users: users, as: :user})
     end
   end