A chance for the DM to use advantage as a DM tool
In a given situation, if you feel that the rogue player by actively taking the scouting role is setting up a favorable circumstance, then you can provide advantage to the passive perception. If not, then don't. This is where your rulings can make a difference in the game and free you of some die rolling. The basic benefit is that you add 5 to the passive score if you rule that the rogue has advantage. In that case, the trap DC may be overcome.
If not, well, traps are intended to work and are usually hidden, so someone tripping a trap is a thing that happens during play sometimes.
Basic Rules, page 4. (PHB, Introduction, p. 7)
Advantage and Disadvantage
Advantage reflects the positive circumstances surrounding a d20 roll, while disadvantage reflects the opposite.
Basic Rules, page 57 (PHB, Ch 7, p. 173)
The DM can also decide that circumstances influence a roll in one
direction or the other and grant advantage or impose disadvantage as a
Basic Rules, page 59 (PHB, CH 7, p. 175)
Here’s how to determine a character’s total for a passive check:
10 + all modifiers that normally apply to the check
If the character has advantage on the check, add 5. For disadvantage,
subtract 5. The game refers to a passive check total as a score.
You make the call. The rules give you that latitude. In this particular case, does the rogues scouting, or how the rogue's player described it to you, suggest to you that they should get advantage on the passive ability check, or not?