Remove placeholder_playerdata

[pg9182]

Not needed since v1.10 (R2Northstar/NorthstarLauncher@841881a).

[pg9182]

@GeckoEidechse

[GeckoEidechse]

Requesting review from @BobTheBob9 cause he wrote R2Northstar/NorthstarLauncher#171

[pg9182]

I've already talked to @BobTheBob9 about this while we were discussing Atlas default pdata updates and the big refactor.

[GeckoEidechse]

Note to self that this file is the only file in R2Northstar folder, so removing it will remove the folder from GitHub repo. Need to check CI code so that it isn't setup to expect that folder existing and as such break when the folder is gone.

[pg9182]

Should be fine since the next command uses mkdir -p.

[GeckoEidechse]

Uh actually, how does reset persistence work without it? ^^"

[GeckoEidechse]

> Shouldn't break anything he said in vc
> breaks docker image in two separate ways :,)

[pg9182]

Well, the idea was that the docker update for the NS version would include the required changes. Unfortunately, unlike v1.13.0, I wasn't available at the time of release...