[FIX] website: prevent file icon from becoming invisible

[Guillaume-gdi]

This commit permits to keep document icon visible during the translation of a website page.

Steps to reproduce the issue:

• Have a website in English (main) and French
• Edit the website in the main lang (English)
• Drop Image text block
• Change the image to a document
• Save
• Edit the translation in French

=> The document logo becomes invisible.

This commit fixes this issue.

task-3626918

[robodoo]

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