Revert bug in charge mirror AF3 code, and add missing copywrite statements
In !63562 (merged) a bug was accidentally introduced that changed the mirroring behavior for particles of different charge. This MR reverts this change. It also adds some missing Copywrite statements from that previous MR. (For files changed in the previous request 2023 is used, while for the file fixed in this MR 2024 is used).
NOTE: this bug is in 23.0 and therefore this MR targets this release. The bug is not present in main. THIS MR SHOULD NOT BE SWEPT TO MAIN.