Fix /back tp offsets

[Lyfts]

Summary

Re-adds the +0.5 offset to x and z coords to ensure the player doesn't spawn in a wall and lowers the y offset from 0.5 to 0.3 which is enough to spawn above a grave while not hitting the block above.

Closes #323

Checklist

• I have tested this PR in DevEnv
• I have tested this PR in Fullpack
• This PR is in compliance with the GTNH AI Policy
• This PR requires another PR in order to merge

[github-actions]

#328

[Sanduhr32]

what happens if a player died on a lower slab?

[Lyfts]

Not a whole lot since dying on a slab means there will always be at least 2.5 blocks worth of space above it, otherwise the player wouldn't be able to stand there.

[Sanduhr32]

yeah but wouldnt the grave spawn in the block above the slab? wouldnt the player get teleported .2 blocks below their grave stone?

[Lyfts]

It has the same amount of space above as when dying above any other block, thus the behavior is the same. The player spawns on top of the grave stone, so the space beneath it is also a non-issue.