Revert "Relocate prometheus-nginxlog-exporter (#4938)"

This reverts commit 789e2ad341.

setup.yml

@@ -101,7 +101,6 @@
     - custom/matrix-synapse-usage-exporter
     - galaxy/prometheus_nginxlog_exporter
     - galaxy/matrix_meshtastic_relay
-    - galaxy/prometheus_nginxlog_exporter
     - galaxy/matrix_meshtastic_relay
     - galaxy/prometheus_node_exporter
     - galaxy/prometheus_postgres_exporter