Remove unnecssary <br> from adlist details

[yubiuser]

• What does this PR aim to accomplish?:

Removes an unnecessary <br> between date and time in adlist details when on mobile.

• How does this PR accomplish the above?:

Set false flag in utils.datetime to remove the break.
https://github.com/pi-hole/AdminLTE/blob/1714b082c3a233ea3a0c344b50352c59818676fc/scripts/pi-hole/js/utils.js#L135-L137

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