patch 8.0.0858: can exit while a terminal is still running a job

Problem:    Can exit while a terminal is still running a job.
Solution:   Consider a buffer with a running job like a changed file.
diff --git a/src/normal.c b/src/normal.c
index d655c74..16f9f0e 100644
--- a/src/normal.c
+++ b/src/normal.c
@@ -6255,11 +6255,11 @@
     if (ptr != NULL)
     {
 	/* do autowrite if necessary */
-	if (curbufIsChanged() && curbuf->b_nwindows <= 1 && !P_HID(curbuf))
+	if (curbufIsChanged() && curbuf->b_nwindows <= 1 && !buf_hide(curbuf))
 	    (void)autowrite(curbuf, FALSE);
 	setpcmark();
 	if (do_ecmd(0, ptr, NULL, NULL, ECMD_LAST,
-				   P_HID(curbuf) ? ECMD_HIDE : 0, curwin) == OK
+				buf_hide(curbuf) ? ECMD_HIDE : 0, curwin) == OK
 		&& cap->nchar == 'F' && lnum >= 0)
 	{
 	    curwin->w_cursor.lnum = lnum;