patch 8.2.3671: restarting Insert mode in prompt buffer too often

Problem:    Restarting Insert mode in prompt buffer too often when a callback
            switches windows and comes back. (Sean Dewar)
Solution:   Do not set "restart_edit" when already in Insert mode.
diff --git a/src/version.c b/src/version.c
index 1918890..0686cfa 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3671,
+/**/
     3670,
 /**/
     3669,