Move more gerons for sake of Entrance Rando

[Miepee]

The following gerons cause some issues:

• Operations Deck Central Nexus. Stunlocks if you enter via door:

Not quite sure how to fix. Raddley has experimented with this:

But while that fixes the stunlock, it doesn't fix the player having no time to react and taking a mandatory hit from it. Might need some more level design shenanigans, or maybe some code change? (e.g. making pb geron deal no damage for the first ~20 frames on room load)

[Miepee]

• S1 Yameba corridor. Hard to react to:

Should be easily fixable by moving it 1/2 tiles to the left. When coming from the left, you get the speedbooster near the slope, so we have quite a bit of leeway here.

[Miepee]

• S5 Arctic Containment. Hard to react to:

We could maybe try moving it a few tiles to the right, but not sure how much that would help. We're kinda limited here as we ideally still want to make it possible to screw the geron if coming from the tunnel. Otherwise see Central Nexus geron for ideas.