change deprecated settings

config/default.nix

@@ -228,14 +228,15 @@
             ];
         };
 
-        extensions = {
+      };          
-          # Creates a beautiful debugger UI
+
       dap-ui = {
         enable = true;
 
         # Set icons to characters that are more likely to work in every terminal.
         # Feel free to remove or use ones that you like more! :)
         # Don't feel like these are good choices.
+        settings = {
             icons = {
                 expanded = "▾";
                 collapsed = "▸";
@@ -256,15 +257,15 @@
                 };
             };
         };
+      };
 
       dap-virtual-text.enable = true;
 
-          # Add debuggers here?
+      # Add debuggers here
       dap-python = {
         enable = true;
       };
-        };
+
-      };
 
       dap-lldb = {
         enable = true;