Simplify the `skip_before_filter` logic for UploadsController

app/controllers/projects/uploads_controller.rb

 class Projects::UploadsController < Projects::ApplicationController
   layout 'project'
 
-  # We want to skip these filters for only the `show` action if `image?` is true,
-  # but `skip_before_filter` doesn't work with both `only` and `if`, so we accomplish the same like this.
-  skipped_filters = [:authenticate_user!, :reject_blocked!, :project, :repository]
-  skip_before_action  *skipped_filters, only: [:show]
-  before_action       *skipped_filters, only: [:show], unless: :image?
+  skip_before_action :authenticate_user!, :reject_blocked!, :project,
+    :repository, if: -> { action_name == 'show' && image? }
 
   def create
     link_to_file = ::Projects::UploadService.new(project, params[:file]).