uploads: fix My Uploads page showing Admins uploads for other users.

Fix the "My Uploads" page showing Admins all uploads, not just their own
uploads.

Changes the URL of the My Uploads page from /uploads to /users/:id/uploads.

config/routes.rb

@@ -264,6 +264,7 @@ Rails.application.routes.draw do
     end
     resource :password, only: [:edit, :update]
     resources :api_keys, only: [:new, :create, :edit, :update, :index, :destroy]
+    resources :uploads, only: [:index]
 
     collection do
       get :custom_style