Don't show save as menu entry in web

Author: timon-schelling

editor/src/messages/portfolio/menu_bar/menu_bar_message_handler.rs

@@ -110,6 +110,7 @@ impl LayoutHolder for MenuBarMessageHandler {
 							disabled: no_active_document,
 							..MenuBarEntry::default()
 						},
+						#[cfg(not(target_family = "wasm"))]
 						MenuBarEntry {
 							label: "Save As…".into(),
 							icon: Some("Save".into()),