Revert "Consider an autoload resolved if #resolve didn't return nil i…

…n Autoload#call"

CodeLoader.require returning false doesn't necessarily mean the feature
got loaded.

This reverts commit 01a7c2f.

[ci skip]

core/autoload.rb

@@ -40,7 +40,7 @@ def call(under, honor_require=false)
     if !undefined.equal?(constant) && Thread.current == thread
       constant
     else
-      worked = !resolve.nil?
+      worked = resolve
 
       if !honor_require or worked
         find_const under