Reduce the default TPS (#5326)

It is our suggestion for a long while to keep the TPS at 30 for servers. However the default was always 60.

I believe its better to have it as a default.

RELEASE-NOTES.md

@@ -48,6 +48,7 @@ END TEMPLATE-->
 ### Other
 
 * Added obsoletion warning for `Control.Dispose()`. New code should not rely on it.
+* Reduced the default tickrate to 30 ticks.
 
 ### Internal
 

Robust.Server/server_config.toml

@@ -9,7 +9,7 @@ level = 1
 enabled = false
 
 [net]
-tickrate = 60
+tickrate = 30
 port = 1212
 bindto = "::,0.0.0.0"
 max_connections = 256

Robust.Shared/CVars.cs

@@ -289,7 +289,7 @@ namespace Robust.Shared
         /// This influences both how frequently game code processes, and how frequently updates are sent to clients.
         /// </summary>
         public static readonly CVarDef<int> NetTickrate =
-            CVarDef.Create("net.tickrate", 60, CVar.ARCHIVE | CVar.REPLICATED | CVar.SERVER);
+            CVarDef.Create("net.tickrate", 30, CVar.ARCHIVE | CVar.REPLICATED | CVar.SERVER);
 
         /// <summary>
         /// Offset CurTime at server start by this amount (in seconds).