Fix 2 issues of New-PodeLoggingMethod -File

[nightroman]

This PR fixes two issues described below.

Given this file logger

	$logging = New-PodeLoggingMethod -File -Path C:\TEMP -Name pode -MaxDays 1
	Enable-PodeRequestLogging $logging
	Enable-PodeErrorLogging $logging

Issue 1: -MaxDays may not work

Pode does not remove old files if the server restarts daily or more frequently (I think this is a typical local scenario).

Why. On starting NextClearDown is set to [DateTime]::Now.Date and then it is checked as NextClearDown -lt [DateTime]::Now.Date. This condition is always false on daily restarts and removal of old logs never happens.

Issue 2: Pode may remove wrong logs

This original code is supposed to remove all "old" *.log files in C:\TEMP, not necessarily related to the specific file logger "pode"

	$null = Get-ChildItem -Path $options.Path -Filter '*.log' -Force |
		Where-Object { $_.CreationTime -lt $date } |
		Remove-Item -Force

I think the filter should be "$($options.Name)_*.log" in order to remove relevant files only.