(fix) address several compiler warnings

apps/block_scout_web/lib/block_scout_web/controllers/active_pools_controller.ex

@@ -1,14 +1,12 @@
 defmodule BlockScoutWeb.ActivePoolsController do
   use BlockScoutWeb, :controller
 
-  alias BlockScoutWeb.ActivePoolsView
-
   def index(conn, params) do
     []
     |> handle_render(conn, params)
   end
 
-  defp handle_render(full_options, conn, _params) do
+  defp handle_render(_full_options, conn, _params) do
     render(conn, "index.html")
   end
 end

apps/block_scout_web/lib/block_scout_web/controllers/common_components_controller.ex

@@ -1,14 +1,12 @@
 defmodule BlockScoutWeb.CommonComponentsController do
   use BlockScoutWeb, :controller
 
-  alias BlockScoutWeb.CommonComponentsView
-
   def index(conn, params) do
     []
     |> handle_render(conn, params)
   end
 
-  defp handle_render(full_options, conn, _params) do
+  defp handle_render(_full_options, conn, _params) do
     render(conn, "index.html")
   end
 end

apps/block_scout_web/lib/block_scout_web/controllers/inactive_pools_controller.ex

@@ -1,14 +1,12 @@
 defmodule BlockScoutWeb.InactivePoolsController do
   use BlockScoutWeb, :controller
 
-  alias BlockScoutWeb.InactivePoolsView
-
   def index(conn, params) do
     []
     |> handle_render(conn, params)
   end
 
-  defp handle_render(full_options, conn, _params) do
+  defp handle_render(_full_options, conn, _params) do
     render(conn, "index.html")
   end
 end

apps/block_scout_web/lib/block_scout_web/controllers/stakes_controller.ex

@@ -1,14 +1,12 @@
 defmodule BlockScoutWeb.StakesController do
   use BlockScoutWeb, :controller
 
-  alias BlockScoutWeb.StakesView
-
   def index(conn, params) do
     []
     |> handle_render(conn, params)
   end
 
-  defp handle_render(full_options, conn, _params) do
+  defp handle_render(_full_options, conn, _params) do
     render(conn, "index.html")
   end
 end

apps/block_scout_web/lib/block_scout_web/controllers/validators_controller.ex

@@ -1,14 +1,12 @@
 defmodule BlockScoutWeb.ValidatorsController do
   use BlockScoutWeb, :controller
 
-  alias BlockScoutWeb.ValidatorsView
-
   def index(conn, params) do
     []
     |> handle_render(conn, params)
   end
 
-  defp handle_render(full_options, conn, _params) do
+  defp handle_render(_full_options, conn, _params) do
     render(conn, "index.html")
   end
 end