Fix pg_dumpall option parsing: -i doesn't take an argument.

This used to work properly, but got fat-fingered in commit
3dee636e.  Per bug #9620 from
Nicolas Payart.

src/bin/pg_dump/pg_dumpall.c

@@ -195,7 +195,7 @@ main(int argc, char *argv[])
 
 	pgdumpopts = createPQExpBuffer();
 
-	while ((c = getopt_long(argc, argv, "acd:f:gh:i:l:oOp:rsS:tU:vwWx", long_options, &optindex)) != -1)
+	while ((c = getopt_long(argc, argv, "acd:f:gh:il:oOp:rsS:tU:vwWx", long_options, &optindex)) != -1)
 	{
 		switch (c)
 		{