header.ps1: Remove the -ErrorAction default parameter

I don't think it's really needed now, and it was a bit ill-conceived from the start.

app/Pog/lib/header.ps1

@@ -1,14 +1,7 @@
 Set-StrictMode -Version 3
 $ErrorActionPreference = [System.Management.Automation.ActionPreference]::Stop
 
-# pass `-ErrorAction Stop` to all commands; this is a second line of defence
-#  after `$ErrorActionPreference` and ideally shouldn't be needed, but in some
-#  contexts (e.g. apparently when calling $PSCmdlet.WriteError), it is necessary
-#  to locally override $ErrorActionPreference
-$script:PSDefaultParameterValues = @{
-	"*:ErrorAction" = [System.Management.Automation.ActionPreference]::Stop
-}
-
+# ensure that the Pog compiled library is loaded everywhere
 if (-not (Test-Path Env:POG_DEBUG)) {
 	Import-Module $PSScriptRoot\..\lib_compiled\Pog.dll
 } else {