test(orval): align path key in #1935 fixture with userId path param

Make the standalone projects.yaml a valid OpenAPI document by changing
its path key from `/projects` to `/users/{userId}/projects` so the
declared `userId` path parameter matches the path template. Update the
root $ref accordingly to use the JSON Pointer / percent-encoded escape,
mirroring the existing issue-3380 fixture. No change to bundled output.

Author: wadakatu

tests/specifications/issue-1935/issue-1935.yaml

@@ -9,5 +9,5 @@ info:
 # - the barrel re-exports         → external concrete schema file (schemas/UserProjectDTO.yaml)
 paths:
   '/users/{userId}/projects':
-    $ref: './path/projects.yaml#/paths/~1projects'
+    $ref: './path/projects.yaml#/paths/~1users~1%7BuserId%7D~1projects'
 components: {}

tests/specifications/issue-1935/path/projects.yaml

@@ -3,7 +3,7 @@ info:
   title: User Projects
   version: 1.0.0
 paths:
-  /projects:
+  /users/{userId}/projects:
     get:
       operationId: getUserProjects
       summary: Retrieve all related projects for the userId