Fix incorrect last visit date in the customer grid

[cirykpopeye]

Questions	Answers
Branch?	develop
Description?	Last visit date was incorrect, it used the date_add from the customer table while it should use the connections table.
Type?	bug fix
BC breaks?	no
Category	BO
Deprecations?	no
How to test?	In the customer table, try login back in on the frontend and you will not see the last visit date change, with this fix you will.

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This change is 

[prestonBot]

Hello @cirykpopeye!

This is your first pull request on the PrestaShop project. Thank you, and welcome to this Open Source community!

[prestonBot]

Hi!

Your pull request description seems to be incomplete or malformed:

• The category should be one of: FO, BO, CO, IN, TE, WS, LO

Would you mind completing the contribution table ? This would help us understand how interesting your contribution is.

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[cirykpopeye]

Hi!

Your pull request description seems to be incomplete or malformed:

• The category should be one of: FO, BO, CO, IN, TE, WS, LO

Would you mind completing the contribution table ? This would help us understand how interesting your contribution is.

Thank you!

(note: this is an automated message, but answering it will reach a real human )

Ok, this was updated.

[PierreRambaud]

ping @sarjon Wdyt?

[sarjon]

Yup, makes sense. 👍

[PierreRambaud]

Thanks @cirykpopeye