remove the file engine feature in the html crate (#3392)

packages/web/src/events/form.rs

@@ -106,21 +106,27 @@ impl HasFormData for WebFormData {
 }
 
 impl HasFileData for WebFormData {
-    #[cfg(feature = "file_engine")]
     fn files(&self) -> Option<std::sync::Arc<dyn dioxus_html::FileEngine>> {
-        let files = self
-            .element
-            .dyn_ref()
-            .and_then(|input: &web_sys::HtmlInputElement| {
-                input.files().and_then(|files| {
-                    #[allow(clippy::arc_with_non_send_sync)]
-                    crate::file_engine::WebFileEngine::new(files).map(|f| {
-                        std::sync::Arc::new(f) as std::sync::Arc<dyn dioxus_html::FileEngine>
+        #[cfg(feature = "file_engine")]
+        {
+            let files = self
+                .element
+                .dyn_ref()
+                .and_then(|input: &web_sys::HtmlInputElement| {
+                    input.files().and_then(|files| {
+                        #[allow(clippy::arc_with_non_send_sync)]
+                        crate::file_engine::WebFileEngine::new(files).map(|f| {
+                            std::sync::Arc::new(f) as std::sync::Arc<dyn dioxus_html::FileEngine>
+                        })
                     })
-                })
-            });
+                });
 
-        files
+            files
+        }
+        #[cfg(not(feature = "file_engine"))]
+        {
+            None
+        }
     }
 }