patch 8.2.3537: mode() does not return the right value in 'operatorfunc'

Problem:    mode() does not return the right value in 'operatorfunc'.
Solution:   Reset finish_op while calling 'operatorfunc'.
diff --git a/src/version.c b/src/version.c
index 2049889..2e076cb 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3537,
+/**/
     3536,
 /**/
     3535,