Set the end date for live query update to end of epoch

[rrobgill]

What does this PR aim to accomplish?:

Allow live query view to continue indefinitely.

Fixes issue raised in https://github.com/pi-hole/web/issues/3676 where live query stops at end of day.

How does this PR accomplish the above?:

Sets the until date for live query view to end of epoch, rather than end of day.

(End of day remains unchanged as default for date picker).

Link documentation PRs if any are needed to support this PR:

N/A

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