patch 8.2.0762: buffer is not considered modified after setting crypt key

Problem:    Buffer is not considered modified after setting crypt key.
Solution:   Set the modified flag. (Christian Brabandt, closes #6082)
diff --git a/src/version.c b/src/version.c
index c631d54..90773d3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    762,
+/**/
     761,
 /**/
     760,