fix(mimic-iv-note): correct postgres quickstart data paths

[acnimma]

Summary

• mimic_data_dir -> mimic-iv/2.2/note after the wget mv
• Fix cleanup paths and remove stray rmdir rm

Test plan

• Paths match a fresh wget + mv tree

The note postgres quickstart renames the download tree to mimic-iv, but still pointed mimic_data_dir at the nested mimic-iv/mimic-iv-note/... path and used rmdir rm in the cleanup comment.

[alistairewj]

the commented out paths are still incorrect but I'm merging for convenience since they are commented out and the real fix is there