fix: Space around techers images on course about page

[Lunyachek]

This is backport from master - #34357

Description

This is a strange bug. It is related to a typo in the inline styles style="margin:0 20 px 0" - there was a space between 20 and px in the course about page template, which is the default for new courses. These styles did not work, so we could not see the bug. Then, in this pull request - #32890 - this typo was fixed, and now we are observing this bug (as shown in the screenshot below). We believe that this margin is completely unnecessary for the <img> tag, as the border and margin are set on the parent div teacher-image

Before fix

After fix

Also RTL version

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