move close_button to ui/widgets.rs as x_button

Signed-off-by: kernelkind <kernelkind@gmail.com>

crates/notedeck_columns/src/ui/mod.rs

@@ -19,6 +19,7 @@ pub mod thread;
 pub mod timeline;
 pub mod username;
 pub mod wallet;
+pub mod widgets;
 
 pub use accounts::AccountsView;
 pub use mention::Mention;