Remove some event dispatchers

svelte/src/filesystem/edit_window/BrandingOptions.svelte

@@ -33,12 +33,12 @@ const pick_image = (type: string) => {
 	picking = type
 	picker.open(file.path)
 }
-const handle_picker = async (e: CustomEvent<FSNode[]>) => {
-	if (e.detail.length !== 1) {
+const handle_picker = async (nodes: FSNode[]) => {
+	if (nodes.length !== 1) {
 		alert("Please select one file")
 		return
 	}
-	let f = e.detail[0]
+	let f = nodes[0]
 
 	if (fs_node_type(f) !== "image") {
 		alert("Please select an image file")
@@ -52,7 +52,7 @@ const handle_picker = async (e: CustomEvent<FSNode[]>) => {
 	if (!f.is_shared()) {
 		try {
 			f = await fs_update(
-				e.detail[0].path,
+				nodes[0].path,
 				{link_permissions: {read: true} as FSPermissions},
 			)
 		} catch (err) {
@@ -186,7 +186,7 @@ run(() => {
 	</div>
 </fieldset>
 
-<FilePicker bind:this={picker} on:files={handle_picker}/>
+<FilePicker bind:this={picker} callback={handle_picker}/>
 
 <style>
 input[type="color"] {