patch 8.2.0004: get E685 and E931 if buffer reload is interrupted

Problem:    Get E685 and E931 if buffer reload is interrupted.
Solution:   Do not abort deleting a dummy buffer. (closes #5361)
diff --git a/src/window.c b/src/window.c
index 5b407d5..b66fb34 100644
--- a/src/window.c
+++ b/src/window.c
@@ -2410,7 +2410,7 @@
 
 	set_bufref(&bufref, curbuf);
 	win->w_closing = TRUE;
-	close_buffer(win, win->w_buffer, action, abort_if_last);
+	close_buffer(win, win->w_buffer, action, abort_if_last, FALSE);
 	if (win_valid_any_tab(win))
 	    win->w_closing = FALSE;
 	// Make sure curbuf is valid. It can become invalid if 'bufhidden' is
@@ -2677,7 +2677,8 @@
 
     if (win->w_buffer != NULL)
 	// Close the link to the buffer.
-	close_buffer(win, win->w_buffer, free_buf ? DOBUF_UNLOAD : 0, FALSE);
+	close_buffer(win, win->w_buffer, free_buf ? DOBUF_UNLOAD : 0,
+								 FALSE, FALSE);
 
     // Careful: Autocommands may have closed the tab page or made it the
     // current tab page.
@@ -5001,7 +5002,7 @@
     if (bt_popup(win->w_buffer))
 	win_close_buffer(win, DOBUF_WIPE_REUSE, FALSE);
     else
-	close_buffer(win, win->w_buffer, 0, FALSE);
+	close_buffer(win, win->w_buffer, 0, FALSE, FALSE);
 # if defined(FEAT_TIMERS)
     if (win->w_popup_timer != NULL)
 	stop_timer(win->w_popup_timer);