Remove on leave indication (#39121)

Removing on leave indication since @ChrsMark is back.

Author: jlind23

README.md

@@ -90,7 +90,7 @@ Emeritus Triagers:
 Approvers ([@open-telemetry/collector-contrib-approvers](https://github.com/orgs/open-telemetry/teams/collector-contrib-approvers)):
 
 - [Arthur Silva Sens](https://github.com/ArthurSens), Grafana Labs
-- [Christos Markou](https://github.com/ChrsMark), Elastic (on leave)
+- [Christos Markou](https://github.com/ChrsMark), Elastic
 - [Curtis Robert](https://github.com/crobert-1), Splunk
 - [David Ashpole](https://github.com/dashpole), Google (on leave)
 - [Edmo Vamerlatti Costa](https://github.com/edmocosta), Elastic