Don't revert to Advanced Editor for pasted problems

[pomegranited]

When editing a Problem component that was pasted into a Content Library, the Advanced Editor is being shown. Instead, show the problem-type-specific editor.

Issue was reproduced this on tagging-preview (see e.g. "Multiple Choice" problem in lib:OpenCraft:TL).

[bradenmacdonald]

@pomegranited The problem is the markdown and url_name fields. When I removed them from that example block, it started working.

We need to fix the paste code so it strips out the url_name attribute on paste. As for markdown, I'm not sure why it's there but I suspect if it was there, the MFE editor wouldn't have been working in the course that you copied it from either.

[bradenmacdonald]

@jmakowski1123 Please confirm if this bug is fixed on the sandbox.

[jmakowski1123]

Here are examples where I'm still seeing this happen:

In this problem bank: https://cms.tagging-preview.staging.do.opencraft.hosting/container/block-v1:OpenCraft+LLC+24+type@itembank+block@390fb3f0ca01491b9dea7198d19d4efe

In the last problem in this unit: https://cms.tagging-preview.staging.do.opencraft.hosting/container/block-v1:OpenCraft+LLC+24+type@vertical+block@77cec5e7d5c040d39641f427bea7475b

[jmakowski1123]

Related bug? #1377

[bradenmacdonald]

@jmakowski1123 Someone had turned off the MFE editors on the sandbox. I just turned them back on, and everything seems to be working. Please let me know if you spot any more issues.