engine: server: remove FCVAR_SERVER from gamedir cvar, set FCVAR_READ_ONLY instead. Seems it was used when Xash had hot change game, i.e. without restarting engine.

engine/server/sv_main.c

@@ -846,7 +846,7 @@ void SV_Init( void )
 	Cvar_Get ("protocol", va( "%i", PROTOCOL_VERSION ), FCVAR_READ_ONLY, "displays server protocol version" );
 	Cvar_Get ("suitvolume", "0.25", FCVAR_ARCHIVE, "HEV suit volume" );
 	Cvar_Get ("sv_background", "0", FCVAR_READ_ONLY, "indicate what background map is running" );
-	Cvar_Get( "gamedir", GI->gamefolder, FCVAR_SERVER, "game folder" );
+	Cvar_Get( "gamedir", GI->gamefolder, FCVAR_READ_ONLY, "game folder" );
 	Cvar_Get( "sv_alltalk", "1", 0, "allow to talking for all players (legacy, unused)" );
 	Cvar_Get( "sv_allow_PhysX", "1", FCVAR_ARCHIVE, "allow XashXT to usage PhysX engine" );			// XashXT cvar
 	Cvar_Get( "sv_precache_meshes", "1", FCVAR_ARCHIVE, "cache SOLID_CUSTOM meshes before level loading" );	// Paranoia 2 cvar