Correct Zen Cart behaviour in 1.3.9 is to add br tags to the product description where a production description has no other html.
This was added to deal with a specific issue where some users were neither using an HTML editor, nor inserting their own HTML. So their product descriptions were all screwed up.
You want it to act the opposite way, in order to do something which it's not designed to do. That's fine. This is open source and you can change it to work however you want, and we've told you the change to make it work as you want.
For good measure, as an alternative, we've also told you how to achieve what you want to achieve the Zen Cart way.
So I'm confused as to what more you want.
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