help-errmgr-base.txt: remove trailing newline

Removed spurrious newline at end of file so that the emitted help
message doesn't contain a blank line before the final "-----" output.

orte/mca/errmgr/base/help-errmgr-base.txt

@@ -69,4 +69,3 @@ This is usually due to either a failure of the TCP network
 connection to the node, or possibly an internal failure of
 the daemon itself. We cannot recover from this failure, and
 therefore will terminate the job.
-