Fix LiveDashboard redirect not working when user added a path segment

/phoenix/live_dashboard -> /pleroma/live_dashboard would work

/phoenix/live_dashboard/ecto_stats -> /pleroma/live_dashboard/ecto_stats
would not work and instead reply with FE.

lib/pleroma/web/fallback/redirect_controller.ex

@@ -29,9 +29,18 @@ defmodule Pleroma.Web.Fallback.RedirectController do
     )
   end
 
-  def live_dashboard(conn, _params) do
+  def live_dashboard(conn, %{"path" => path}) do
+    query_params = conn.query_string
+
+    redirect_path =
+      if query_params == "" do
+        "/pleroma/live_dashboard/#{path}"
+      else
+        "/pleroma/live_dashboard/#{path}?#{query_params}"
+      end
+
     conn
-    |> redirect(to: "/pleroma/live_dashboard")
+    |> redirect(to: redirect_path)
   end
 
   def redirector(conn, _params, code \\ 200) do

lib/pleroma/web/router.ex

@@ -1088,7 +1088,7 @@ defmodule Pleroma.Web.Router do
     get("/:maybe_nickname_or_id", RedirectController, :redirector_with_meta)
     match(:*, "/api/pleroma/*path", LegacyPleromaApiRerouterPlug, [])
     get("/api/*path", RedirectController, :api_not_implemented)
-    get("/phoenix/live_dashboard", RedirectController, :live_dashboard)
+    get("/phoenix/live_dashboard/*path", RedirectController, :live_dashboard)
     get("/*path", RedirectController, :redirector_with_preload)
 
     options("/*path", RedirectController, :empty)