patch 8.0.1000: cannot open a terminal without running a job in it

Problem:    Cannot open a terminal without running a job in it.
Solution:   Make ":terminal NONE" open a terminal with a pty.
diff --git a/src/misc2.c b/src/misc2.c
index 17fa424..d431a94 100644
--- a/src/misc2.c
+++ b/src/misc2.c
@@ -6321,7 +6321,7 @@
 {
     /* For Win32 mch_breakcheck() does not check for input, do it here. */
 # if defined(WIN32) && defined(FEAT_JOB_CHANNEL)
-    channel_handle_events();
+    channel_handle_events(FALSE);
 # endif
 
 # ifdef FEAT_NETBEANS_INTG