"Release Marks" and "Unrelease Marks" button does not work for remark results

[alyshakwok]

"Release Marks"
Steps to reproduce:

1. From a student's login view with a result, submit a remark request
2. Login to teacher's view, fill in marking rubric
3. Set status to complete
4. Click to Submission tab
5. Select corresponding group in grade's table
6. Click "Release Marks"

Expected: remark result should be released
Actual: remark result remains completed but not released (can click group name from table to check)

"Unrelease Marks"
Steps to reproduce:

1. From a student's login view with a result, submit a remark request
2. Login to teacher's view, fill in marking rubric
3. Set status to complete
4. Release result from the submission marking page
5. Navigate to grades table
6. Select corresponding group
7. Click "Unrelease Marks"

Expected: remark result should not be released
Actual: remark result remains completed and is still released (can click group name from table to check)

[m-wu]

I found that the two buttons are trying to release/unrelease the original result instead of the remark result. This fix should wait until #941 is closed.

[alyshakwok]

Using original result instead of remark if exists is related to issue #1027