fix: Fix for the Paragon modal shadow, which prevents clicking on an elements on the grading page

[Lunyachek]

This is backport from master branch - #357

Minor issue was found on the "View all responses" modal window. This modal window is based on the Paragon Modal component, which has top and bottom shadows to indicate that there is some content at the top or bottom. These shadows are made with :before and :after pseudo-elements and should stick to the top and bottom. Example below:

2024-09-25.15.46.53.mov

But in the Grading modal window, the bottom shadow "has a life of its own" and takes various positions on the page, sometimes covering different elements depending on the scroll position or browser window size. Sometimes it's impossible to click the submit button or select a grade.

In the example below, I colored the bottom pseudo-element :after in red for clarity, to demonstrate that it’s not sticking to the bottom of the page.

2024-09-25.16.00.24.mov

To fix this bug, it is necessary to remove the height: 100% property set for .review-modal-body > div.pgn__modal-body-content. This property was added in this commit: dd880d4

After I removed height: 100%, I didn’t notice any issues with other elements on the page. Perhaps @leangseu-edx could point out if there’s something I might have missed?

2024-09-25.16.03.54.mov

[openedx-webhooks]

Thanks for the pull request, @Lunyachek!

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