make modal draggable

[hiroto1220]

This chage allows you to move the modal that comes up when doing an interactive rebase.
I think this is useful when you want to work on a modal while looking at the goal. (ex. level2 move2)

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[pcottle]

Awesome contribution! But I think this makes all terminal windows draggable, including the window for selecting a level and a bunch others.

Could we just do this change on ./js/views/rebaseView.js so its contained to just the interactive rebase one?

[hiroto1220]

Thanks for the review!
I think it would be fine if all terminal windows are draggable, such as to see Instractions while checking the current conditions.

[pcottle]

Hrm I wasn't able to get it to drag all the way down -- could you?

the goal window successfully can drag all the way down

[hiroto1220]

I wasn't able to do it.
I can do it in the local environment, but not after deployment.😕

[pcottle]

Yeah the draggable jQuery plugin is quite old and I wouldn't be surprised if it's buggy. I might revert this change just so we avoid any bugs but appreciate the PR anyways!