Set `copy_progress_hide_delay` back to 1000

In an issue I requested that we set the delay to 2000. This seems excessive in practice so I'm reverting the delay back to 1000.

src/globals.js

@@ -104,7 +104,7 @@ window.default_taskbar_height = 50;
 window.taskbar_height = window.default_taskbar_height;
 window.upload_progress_hide_delay = 500;
 window.active_uploads = {};
-window.copy_progress_hide_delay = 2000;
+window.copy_progress_hide_delay = 1000;
 window.busy_indicator_hide_delay = 600;
 window.global_element_id = 0;
 window.operation_id = 0;