Removed redundant NSSM_EVENT_STDIN_CREATEPIPE_FAILED.

We aren't faking stdin with a pipe any longer so the message isn't
needed.

messages.mc

@@ -2847,20 +2847,4 @@
 Language = Italian
 Rotazione del file di output %2 in %3 per il servizio %1.
 .
-
-MessageId = +1
-SymbolicName = NSSM_EVENT_STDIN_CREATEPIPE_FAILED
-Severity = Error
-Language = English
-Failed to set up a pipe to fake stdin for service %1.
-CreatePipe(): %2
-.
-Language = French
-Failed to set up a pipe to fake stdin for service %1.
-CreatePipe(): %2
-.
-Language = Italian
-Impossibile configurare una pipe per simulare lo stdin al servizio %1.
-CreatePipe(): %2
-.