[ACS-7582] Fix dialog upload

[tomson7777]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation
• Other... Please describe:

[tomson7777]

For some file extensions image is not visible, and 'close' button font-weight is off

what file have you used?

[nikita-web-ua]

For some file extensions image is not visible, and 'close' button font-weight is off

what file have you used?

file with .md extension

[tomson7777]

For some file extensions image is not visible, and 'close' button font-weight is off

what file have you used?

file with .md extension

it works already you can recheck

[tomson7777]

For some file extensions image is not visible, and 'close' button font-weight is off

font fixed here: Alfresco/alfresco-content-app#3814