fix: normalize url (#76)

models.py

@@ -2,6 +2,7 @@ import json
 from typing import Optional
 
 from fastapi import Query, Request
+from lnbits.helpers import normalize_path
 from lnurl import encode as lnurl_encode
 from lnurl.types import LnurlPayMetadata
 from pydantic import BaseModel
@@ -61,6 +62,7 @@ class PayLink(BaseModel):
 
     def lnurl(self, req: Request) -> str:
         url = req.url_for("lnurlp.api_lnurl_response", link_id=self.id)
+        url = url.replace(path=normalize_path(url.path))
         url_str = str(url)
         if url.netloc.endswith(".onion"):
             # change url string scheme to http