remove incorrect rewrite

This was originally intended to work the opposite way (the meaning of the original and relocated packages were reversed) and it was needed because of the way fallback used to work. It's only breaking things now and should be safe to remove.

packages/core/src/module-resolver.ts

@@ -119,15 +119,6 @@ export class Resolver {
       return specifier.replace(packageName, pkg.root);
     }
 
-    let originalPkg = this.originalPackage(fromFile);
-    if (originalPkg && pkg.meta['auto-upgraded'] && originalPkg.name === packageName) {
-      // a file that was relocated into a package does a self-import of that
-      // package's name. This can happen when an addon (like ember-cli-mirage)
-      // emits files from its own treeForApp that contain imports of the app's own
-      // fully qualified name.
-      return specifier.replace(packageName, originalPkg.root);
-    }
-
     return specifier;
   }