Fixed a compiler warning

Hi,

Stumbled over this while looking at compiler warnings.
When building with xbuild, this spits out the following warning:

"Remote/BF4Client.cs(539,29): warning CS0114: `PRoCon.Core.Remote.BF4Client.SendGetVarsPunkBusterPacket()' hides inherited member `PRoCon.Core.Remote.FrostbiteClient.SendGetVarsPunkBusterPacket()'. To make the current member override that implementation, add the override keyword. Otherwise add the new keyword"

From the context, I assume the original author wanted an override. If that wasn't the case, feel free to change it to new.

-Fritz