Hide the close button in breadcrumb for the first workbench

[x] Descriptive title for this pull request provided (will be used for release notes later)
[x] All acceptance criteria from the issue are met
[x] Branch is up-to-date with the branch to be merged with, i.e., develop
[x] Code is cleaned up and formatted
[ ] Code documentation written
[ ] Unit tests written
[x] Tested in Chrome
[ ] Tested in Firefox
[x] Build is successful
[x] Summary of changes written
[ ] Wiki documentation written
[x] Assign at least one reviewer
[x] Assign at least one assignee
[x] Add type label (e.g., bug, enhancement) to this pull request
[x] Add next version label (e.g., next-version: minor) to this PR following semver

grafik

Caleydo / ordino