vim-patch:8.2.4932: not easy to filter the output of maplist()

Problem:    Not easy to filter the output of maplist().
Solution:   Add mode_bits to the dictionary. (Ernie Rael, closes vim/vim#10356)

d8f5f76621

Co-authored-by: Ernie Rael <errael@raelity.com>

test/functional/vimscript/map_functions_spec.lua

@@ -30,6 +30,7 @@ describe('maparg()', function()
       buffer=0,
       nowait=0,
       mode='n',
+      mode_bits=0x01,
       abbr=0,
       noremap=1,
       lnum=0,
@@ -157,6 +158,7 @@ describe('maparg()', function()
         buffer = 0,
         expr = 0,
         mode = 'n',
+        mode_bits = 0x01,
         abbr = 0,
         noremap = 1,
         nowait = 0,