fix bogus shroud disable

This code runs everywhere -- and so was clobbering every client's
RenderedPlayer to the player who was setting their cheat.

OpenRA.Game/Traits/Player/DeveloperMode.cs

@@ -81,6 +81,7 @@ namespace OpenRA.Traits
 				case "DevShroudDisable":
 					{
 						DisableShroud ^= true;
+						if (self.World.LocalPlayer == self.Owner)
 							self.World.RenderPlayer = DisableShroud ? null : self.Owner;
 						break;
 					}