1-samples_selection.py f-string transformed to simple string for server correct display

src/pages/1-samples_selection.py

@@ -52,7 +52,7 @@ if not file:
 
 else:
     # extension = file.name.split(".")[-1]
-    userfilename = file.name.replace(f".{file.name.split(".")[-1]}", '')
+    userfilename = file.name.replace("."+file.name.split(".")[-1], '')
 
     match file.name.split(".")[-1]:
         # Load .csv file