Revert "Stop Get-Process from adding exceptions to $Error"

This reverts commit 22d1fc48fa78bb14ed22f024400c9e64ef8c3c34.
Modifying the identification of the pageant and ssh-agent processes

Changing the identification of the pageant / ssh-agent process so an
error being thrown and silently ignored is not an expected scenario and
allows real errors from calling Get-Process to be seen