move embargo action buttons to the bottom

[paulo-graca]

References

• Fixes Usability issue in Embargo's section at submission #1382

Description

Simple HTML change to move embargo action buttons to the bottom of that specific bitstream section.

Instructions for Reviewers

• at the submission form, at the upload section, where you can edit embargo, the actions buttons moved from the top to bottom of that bitstream section, being present for the user. This PR doesn't fix the autosave part of the issue.

[tdonohue]

@paulo-graca : I appreciate this small PR to fix to provide slightly better usability. However, I'm going to close this in favor of a larger usability fix as proposed in #1399 I hope you'll agree that, once this entire section uses a popup modal, the saving behavior will be vastly improved and these current buttons will no longer be necessary at all.

In the meantime, if you or anyone else using 7.0 or 7.1 run into this issue, I do think your PR here is a perfectly OK "quick fix". It'll just be immediately obsolete once #1399 is fixed.