start.ps1: use -NoProfile for starting child

The child powershell is a workaround for an unidentified bug which causes colours to get messed up after using git in the same console window. However, loading profiles on the child is a major slowdown when starting the server, and for no good reason.

start.ps1

@@ -28,7 +28,7 @@ if($file -eq ""){
 }
 
 function StartServer{
-	$command = "powershell " + $binary + " " + $file + " " + $extraPocketMineArgs
+	$command = "powershell -NoProfile " + $binary + " " + $file + " " + $extraPocketMineArgs
 	iex $command
 }