fix(ui): fix attachment picker ui

packages/stream_chat_flutter/lib/src/v4/message_input/stream_attachment_picker.dart

@@ -281,8 +281,6 @@ class _StreamAttachmentPickerState extends State<StreamAttachmentPicker> {
                         icon: widget.customAttachmentTypes[i]
                             .iconBuilder(context, _filePickerIndex == i + 1),
                       ),
-                  ],
-                ),
                     const Spacer(),
                     FutureBuilder(
                       future: PhotoManager.requestPermissionExtend(),
@@ -303,6 +301,8 @@ class _StreamAttachmentPickerState extends State<StreamAttachmentPicker> {
                         return const SizedBox.shrink();
                       },
                     ),
+                  ],
+                ),
                 DecoratedBox(
                   decoration: BoxDecoration(
                     color: _streamChatTheme.colorTheme.barsBg,