Reverting path to event firing webdriver listener

At this time as we have not worked out how to run event_firing_webdriver
as a command line option I am reverting from a runtime variable back to
relative path to listener.

Author: emanlove

atest/acceptance/2-event_firing_webdriver/event_firing_webdriver.robot

@@ -1,5 +1,5 @@
 *** Settings ***
-Library           SeleniumLibrary    event_firing_webdriver=${event_firing_or_none}
+Library           SeleniumLibrary    event_firing_webdriver=${CURDIR}/../../resources/testlibs/MyListener.py
 Resource          resource_event_firing_webdriver.robot
 Suite Setup       Open Browser    ${FRONT PAGE}    ${BROWSER}    alias=event_firing_webdriver
 ...                   remote_url=${REMOTE_URL}    desired_capabilities=${DESIRED_CAPABILITIES}

atest/acceptance/2-event_firing_webdriver/selenium_move_to_workaround.robot

@@ -1,6 +1,6 @@
 *** Settings ***
 Documentation    Can be deleted when minimum Selenium version 4.0
-Library          SeleniumLibrary     event_firing_webdriver=${event_firing_or_none}
+Library          SeleniumLibrary     event_firing_webdriver=${CURDIR}/../../resources/testlibs/MyListener.py
 Library           ../../resources/testlibs/ctrl_or_command.py
 Resource         resource_event_firing_webdriver.robot
 Force Tags       NoGrid