[SE-3949] remove absolute positioning to allow RTL scrolling

Description

This PR fixes RTL scrolling in grade books by removing the absolute positioning of grade-table which prevents scrolling if the direction is not LTR.

*Dependencies*: None

*Screenshots*:

N/A

*Sandbox URL*: https://se-3949-3.stage.opencraft.hosting/

*Merge deadline*: None

*Testing instructions*:

0. Login at https://se-3949-3.stage.opencraft.hosting/login using the standard edx user/password
1. Open the [grade book](https://se-3949-3.stage.opencraft.hosting/courses/course-v1:edX+DemoX+Demo_Course/instructor/api/gradebook)
2. Validate the scrollbar can be scrolled

*Author notes and concerns*:

It is normal and expected if the scrollbar jumps to the right within the grade book after the rules are removed and the language is RTL.

*Reviewers*

  • [ ] @pkulkark

Done

Assignee

David Joy

Reporter

Open Source Pull Request Bot

Labels

Contributor Name

Gábor Boros

Repo

edx/edx-platform

Customer

Epic Link

None

OSCM Assignee

None

Platform Map Area (Levels 1 & 2)

None

Platform Map Area (Levels 3 & 4)

None

Blended Hour Utilization Percentage

None

edX Theme

None

edX Squad

None

Github Lines Added

0

Github Lines Deleted

3

Priority

Unset