Handle whitespace in EXTRA_APIDUMP_ARGS env variable (#60)

Author: mudit-postman

cmd/internal/ec2/postman-insights-agent.service.tmpl

@@ -8,7 +8,7 @@ EnvironmentFile=/etc/default/postman-insights-agent
 # DO NOT CHANGE
 # "${FOO}" uses the argument as is, while "$FOO" splits the string on white space 
 # Reference: https://www.freedesktop.org/software/systemd/man/systemd.service.html#Command%20lines
-ExecStart={{.AgentInstallPath}} apidump --project "${PROJECT_ID}" --interfaces "${INTERFACES}" --filter "${FILTER}" {{.ExtraApidumpArgs}} ${EXTRA_APIDUMP_ARGS}
+ExecStart={{.AgentInstallPath}} apidump --project "${PROJECT_ID}" --interfaces "${INTERFACES}" --filter "${FILTER}" {{.ExtraApidumpArgs}} $EXTRA_APIDUMP_ARGS
 
 [Install]
 WantedBy=multi-user.target