[1.1.107] Player being renamed on load

[Cooldude2606]

When a multiplayer game is saved and then loaded in singleplayer, if you do not exist in the save game then the player with index 1 will be renamed to match your name. This is inconsistent with loading single player save games where you play as index 1 but the player is not renamed.

This results in a scenario where `on_player_joined_game` is raised with a player who's name was never raised by `on_player_created`.
This causes issues where on join has a dependency on actions performed within on created, such as modifying the global table.
It also contradicts previous comments about player names not changing.

Reproduction Steps:

1. Start a new multiplayer game.
2. Save the game (A).
3. Change your name in the settings.
4. Load (SP) save A and note that you are playing as index 1 without being renamed. (expected)
5. Host (MP) save A and note that you are playing as index 2 as a new player. (expected)
6. Save the game (B).
7. Load (SP) save B and note that you are playing as index 2 as the same player. (expected)
8. Change your name in the settings.
9. Load (SP) save B and note that you are playing as index 1 but have been renamed. (unexpected)

This was found while investigating a bug report for a mod but was reproducible in vanilia.