Keep 'Convert' option visible when open

[srmalloy]

When you don't have any remaining Enhancement Convertors, the 'Convert' option disappears from the Enhancements tab on your UI (normally to the right of the 'Manage' option). However, this occurs even if you have the Convert window open at the time, making you find the little red-dot button at the top right of the window to close it, which can be, depending on your UI window arrangement, overlapping another window and hard to see. (I know, zeroth-world problem, but it's still annoying)

 

It's a minor QoL change, but can the 'Convert' option in the Enhancements tab of the UI be modified so that it's always visible when the Convert window is open, even if you've run out of convertors, to make it a little easier to close the window when you're done with it? Once you close the window, the option should still disappear if you don't have any convertors.