Fix obsolete use of metadata (no more in session).

src/routes/parameters/[parameter]/edit.svelte

 <script context="module" lang="ts">
   import { strictAudit } from "@auditors/core"
-  import type { Metadata } from "@openfisca/json-model"
   import {
     auditRawParameterToEditable,
     iterParameterAncestors,
@@ -9,6 +8,7 @@
   import type { LoadInput, LoadOutput } from "@sveltejs/kit"
   import yaml from "js-yaml"
 
+  import { metadata } from "$lib/metadata"
   import { getParameter, labelFromParameterClass } from "$lib/parameters"
   import type { SessionOpenFiscaRepository } from "$lib/sessions"
 
@@ -27,7 +27,6 @@
     }
 
     let unprocessedParameterUrl = newParameterRepositoryRawUrl(
-      session.metadata,
       session.openfiscaRepository,
       processedParameter,
     )
@@ -75,7 +74,6 @@
   }
 
   export function newParameterRepositoryRawUrl(
-    metadata: Metadata,
     { branch, group, project, rawUrlTemplate }: SessionOpenFiscaRepository,
     parameter: Parameter,
   ): string | undefined {