[ruby/prism] Fix merge mishap

Caused by https://github.com/ruby/prism/pull/3478 and https://github.com/ruby/prism/pull/3443

I also made the builder reference more explicit to clearly distinquish
between `::Parser` and `Prism::Translation::Parser`

https://github.com/ruby/prism/commit/d52aaa75b6

lib/prism/translation/parser.rb

@@ -31,11 +31,6 @@ module Prism
         end
       end
 
-      # Create the parser with our custom builder class
-      def initialize(builder = Parser::Builder.new)
-        super
-      end
-
       Racc_debug_parser = false # :nodoc:
 
       # The `builder` argument is used to create the parser using our custom builder class by default.