Revert "Implement overwriting pathgrid records"

This broke pathgrid loading in exterior cells due to an unexpected problem in the pathgrid record system (bug #2195).

This reverts commit dd0cea21b0ead17a13198f3e584d343c6bb31875.
updated changelog
Launcher: fix bugs deleting profiles (Fixes #2188)
Fix bug setting current launcher profile on startup (Bug #2188)