fix symlinks in extra networks ui

'absolute' and 'resolve' are equivalent, but 'resolve' resolves symlinks (which is an obscure specialty behavior usually not wanted) whereas 'absolute' treats symlinks as folders (which is the expected behavior). This commit allows you to symlink folders within your models/embeddings/etc. dirs and have preview images load as expected without issue.

modules/ui_extra_networks.py

@@ -26,7 +26,7 @@ def add_pages_to_demo(app):
     def fetch_file(filename: str = ""):
         from starlette.responses import FileResponse
 
-        if not any([Path(x).resolve() in Path(filename).resolve().parents for x in allowed_dirs]):
+        if not any([Path(x).absolute() in Path(filename).absolute().parents for x in allowed_dirs]):
             raise ValueError(f"File cannot be fetched: {filename}. Must be in one of directories registered by extra pages.")
 
         ext = os.path.splitext(filename)[1].lower()