patch 9.1.0848: if_lua: v:false/v:true are not evaluated to boolean

Problem:  if_lua: v:false/v:true are not evaluated to boolean
Solution: Use lua_pushboolean() instead of lua_pushinteger().
          (zeertzjq)

fixes: #15994
closes: #11419

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index fe1902e..2839e89 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    848,
+/**/
     847,
 /**/
     846,