SetChangeParms not called on all clients

[marrub--]

For some reason, SV_SaveSpawnparms only manages to catch the first client, and SetChangeParms only gets called on that client. Happens on all protocols and cl_nopext/pr_checkextension configurations. Everything works as expected in upstream. Resulting issue is that in co-op, only one player keeps their items.

Steps to reproduce:

• quakespasm +coop 1 +maxplayers 4 +map e1m1 & quakespasm +connect localhost
• Pick up shells as one player, and armor as the other.
• changelevel e1m2 on the host.
• Player 2 will have lost all of their items, as SetChangeParms was skipped for their entity during level transition.