In this game? Pressure is to play a decent game and lose.
As mentioned, 2nd place presumably will give you the bottom half of the draw which should feature Spain and Croatia... And one of BEL/ENG.
Top half (barring surprises) should feature France, Germany, Brazil, Argentina, the other of BEL/ENG.
That's what happens when Russia and Poland are top seeds in 2/8 groups.
I fully understand the logic of why both team's fanbases want play a good game and lose.
But no manager or player ever plays to lose. If both managers play a completely changed team its not because they want to lose.
And yes, in this game, personally i think there is pressure on both sides, because as zee Germans like to point out, both teams have only beaten scrubs so far and this game is actually quite a good test of where both teams are at, and as Belgium are the higher ranked team by quite a stretch, have a much deeper team by quite a stretch and have much "bigger" star players that does put them as favorites and therefore a loss in this game, no matter how irrelevant, should be seen as a failure.