Revert "fix(#300): correctly reference registry url from options" (#311)

src/utils/url.ts

@@ -15,7 +15,8 @@ export function isEmail(email: string): boolean {
 }
 
 export function getRegistryURL(): string {
-  return window.__VERDACCIO_BASENAME_UI_OPTIONS.base;
+  // Don't add slash if it's not a sub directory
+  return `${location.origin}${location.pathname === '/' ? '' : location.pathname}`;
 }
 
 export function extractFileName(url: string): string {