job-list: move include from .h to .c file

Problem: Headers shouldn't be included in header files unless
they are needed for definitions.

Solution: Move include for job-list.h from list.h to list.c.

Author: chu11

src/modules/job-list/list.c

@@ -20,6 +20,7 @@
 #include "src/common/libutil/errno_safe.h"
 #include "src/common/libczmqcontainers/czmq_containers.h"
 
+#include "job-list.h"
 #include "idsync.h"
 #include "list.h"
 #include "job_util.h"

src/modules/job-list/list.h

@@ -13,8 +13,6 @@
 
 #include <flux/core.h>
 
-#include "job-list.h"
-
 void list_cb (flux_t *h, flux_msg_handler_t *mh,
               const flux_msg_t *msg, void *arg);