[OCISDEV-941] Password Protected Folder `Close folder` button is hard to see

[PrajwolAmatya]

JIRA: OCISDEV-941

Describe the bug

The Close folder button for Password Protected Folder is difficult to see at first glance. Had to look twice to find the button because of its visibility.

Expected behavior

The button should be properly visible.

Actual behavior

The button is not properly visible.

Setup

- Web version: 12.4.0
- oCIS version: 8.1.0-rc.1
- browser:chrome

OCIS_XXX=somevalue
OCIS_YYY=somevalue
PROXY_XXX=somevalue

cc @LukasHirt

[LukasHirt]

Might be a regression due to the new themes…