fix(auth): add prefix for basic auth header

Add 'Basic ' as prefix for the Authorization header
when using basic authentication

Author: wiebecommajonas

playgrounds/firecamp-rest/src/services/auth/helpers/basic.ts

@@ -1,16 +1,17 @@
 import { IAuthBasic } from '@firecamp/types';
 
 export default ({ username, password }: IAuthBasic): string => {
+  const _p = 'Basic';
   const _s = `${username}:${password}`;
   if (typeof window !== 'undefined') {
     // Browser
     const utf8String = unescape(encodeURIComponent(_s));
     const base64String = btoa(utf8String);
-    return base64String;
+    return `${_p} ${base64String}`;
   } else {
     // Node.js
     const utf8String = Buffer.from(_s, 'utf8');
     const base64String = utf8String.toString('base64');
-    return base64String;
+    return `${_p} ${base64String}`;
   }
 };