patch 8.2.4685: when a swap file is found for a popup there is no dialog

Problem:    When a swap file is found for a popup there is no dialog and the
            buffer is loaded anyway.
Solution:   Silently load the buffer read-only. (closes #10073)
diff --git a/src/version.c b/src/version.c
index a7df559..930f92e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4685,
+/**/
     4684,
 /**/
     4683,