patch 9.0.0090: no error when assigning bool to a string option

Problem:    No error when assigning bool to a string option with setwinvar().
Solution:   Give an error (closes #10766)
diff --git a/src/version.c b/src/version.c
index 74fb0e1..2becd39 100644
--- a/src/version.c
+++ b/src/version.c
@@ -736,6 +736,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    90,
+/**/
     89,
 /**/
     88,