Fix icon alignment of star and fork buttons

## What does this MR do?

Fix alignment of star and fork icons.

## Why was this MR needed?

Buttons had more padding on the left than on the right.

## What are the relevant issue numbers?

fixes #20001 

## Screenshots

<table>
<thead><th>Before</th><th>After</th></thead>
<tr>
  <td><img alt="fork-button-before" src="/uploads/664c0bc935f4c48899f5b63a1c215cbc/fork-button-before.png"></td>
  <td><img alt="fork-button-after" src="/uploads/9385427a5b178487bd24cd2f8ec4a5ed/fork.png"></td>
</tr>
<tr>
  <td><img alt="project-buttons-before" src="/uploads/48ef41458433b468afc2919eb24849cc/project-buttons-before.png"></td>
  <td><img alt="project-buttons-after" src="/uploads/3bafe6e68645d787a2cdb79cd164335f/project-actions.png"></td>
</tr>
</table>

See merge request !5451