0.24.0 - Specifying any OTEL_ environment variables silently fail startup

After the merge of https://github.com/grafana/docker-otel-lgtm/pull/1253 specifying for instance OTEL_EXPORTER_OTLP_ENDPOINT crashes the startup of the otel collector with no log message of why it crashed. After a bit of analysis this looks like the run-otel scripts modifies the configuration file and this looks for the old `otlphttp` instead of `otlp_http`.