[BUG] FComm implants do not update "last seen" time in implant handler

[Console]

Description

A clear and concise description of what the bug is.

Execution Environment:

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Data	Value
Full Posh version (all the text between the === at the top of the Implant Handler)	PoshC2 v7.3.0 (2c06985 2021-01-12 17:00:37)
Using Docker/containerisation?	WSLv2

Implant Info

• What implant does the problem occur on? FComm
• How was the implant created? Created using scarecrow with donut shellcode x64

Defensive Technologies

• Is the target environment running any particular defensive products? Defender, Carbon Black Cloud.

To Reproduce

Steps to reproduce the behavior: Create new fcomm implant run commands over a period of time on fcomm implant.

Expected behavior

last seen time within implant handler updates to show the time that fcomm last successfully communicated. - This does not occur, last seen time remains stuck at "initialisation" time.

Screenshots

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Additional context

I think this could be related to some of the side improvements to the implant handler brought in as part of the FComm branch.