Simplify Zeitwerk::Cref#path

Comparison using == follows the change we did in

    #153

Then, since cname.name and cname.name.to_s return the same object, we do not
need to interpolate cname.name.

Author: fxn

lib/zeitwerk/cref.rb

@@ -33,7 +33,7 @@ def initialize(mod, cname)
 
   #: () -> String
   def path
-    @path ||= Object.equal?(@mod) ? @cname.name : "#{real_mod_name(@mod)}::#{@cname.name}".freeze
+    @path ||= Object == @mod ? @cname.name : "#{real_mod_name(@mod)}::#{@cname}".freeze
   end
   alias to_s path