Merge bitcoin#17806: test: Change filemode of rpc_whitelist.py

90df922 test: Change filemode of rpc_whitelist.py (Emil Engler)

Pull request description:

  All python tests have the file mode `755`.
  Probably due to a mistake `rpc_whitelist.py` is the only test with the permission `644`.
  This PR makes it coherent with the other tests and updates it to `755` as well.

ACKs for top commit:
  practicalswift:
    ACK 90df922 -- all tests should be executable

Tree-SHA512: b9e69cb5184a3bbee4c7b14ac35985145a9fd3403d0e449d79f15c18e9660cafec495d639f5f730e0c69dde5f4a3d7590b4e42d385e794cd02add1f4e3b785e7

Author: MarcoFalke