patch 8.1.2204: crash on exit when closing terminals

Problem:    Crash on exit when closing terminals. (Corey Hickey)
Solution:   Actually wait for the job to stop. (closes #5100)
diff --git a/src/terminal.c b/src/terminal.c
index 07b2e97..b50198c 100644
--- a/src/terminal.c
+++ b/src/terminal.c
@@ -1494,7 +1494,7 @@
 	if (job->jv_status >= JOB_ENDED)
 	    return OK;
 
-	ui_delay(10L, FALSE);
+	ui_delay(10L, TRUE);
 	term_flush_messages();
     }
     return FAIL;