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>

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    848,
 /**/
     847,
 /**/