Remove Wicked PDF monkey patch

This patch was added in commit baefc249f because both ViewComponent and
Wicked PDF monkey-patched the `render` method and so they were
incompatible.

However, Rails 6.1 includes the patch used by ViewComponent, meaning
ViewComponent doesn't monkey-patch the `render` method anymore, and so
it's compatible with Wicked PDF.

config/initializers/wicked_pdf.rb

@@ -1,27 +1,3 @@
-class WickedPdf
-  # Wicked Pdf magic breaks ViewComponent
-  # https://github.com/mileszs/wicked_pdf/pull/925
-  module PdfHelper
-    def render(*args)
-      options = args.first
-      if options.is_a?(Hash) && options.key?(:pdf)
-        render_with_wicked_pdf(options)
-      else
-        super
-      end
-    end
-
-    def render_to_string(*args)
-      options = args.first
-      if options.is_a?(Hash) && options.key?(:pdf)
-        render_to_string_with_wicked_pdf(options)
-      else
-        super
-      end
-    end
-  end
-end
-
 # WickedPDF Global Configuration
 #
 # Use this to set up shared configuration options for your entire application.