patch 8.0.1834: GUI: find/replace dialog does not handle some chars

Problem:    GUI: find/replace dialog does not handle some chars properly.
Solution:   Escape '?' when needed.  Always escape backslash. (closes #2418,
            closes #2435)
diff --git a/src/version.c b/src/version.c
index e19b180..3e6c09d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1834,
+/**/
     1833,
 /**/
     1832,