Support multiple spaces in custom damage source ID display names

[Dinorush]

Simple change that allows the custom damage source IDs to support multiple spaces rather than only one. The logic relies on string commands to sync them, so having spaces in the names causes issues. Currently it only replaces one space.

For instance, RegisterWeaponDamageSource( "mp_titanweapon_brute4_quad_rocket", "Brute4 Quad Rocket" ) results in a client crash:

With the PR, it works:

[GeckoEidechse]

Uh, is there a quick way to test this PR without installing a custom mod and modifying it? ^^"

[Dinorush]

Base Northstar uses this function to register Peacekraber and Kunai (under Northstar.Custom -> vscripts -> sh_northstar_custom_precache). So you could modify the Peacekraber to use a display name with two spaces to verify that it displays properly in killfeed.

To test if the crash is fixed, all you need to do is have a custom damage ID with 2 spaces in the display name and start the match. The weapon using it need not exist. It'll crash on map start if unfixed since it happens when the client connects.

[GeckoEidechse]

Thanks for the instructions. Confirmed working in testing now.
I checked that using a custom damage source ID display name with more than one game crashes the game and that this PR fixes it.

I did NOT verify that it displays properly in killfeed as my development setup rn doesn't allow me to run the game multiple times and setting up a playtest for this was too cumbersome. So I just hope that part is gonna be fine lol

[F1F7Y]

The changes look fine