Keep match highlight in window move

[KSR-Yasuda]

Keep :match setting in window move mode.

:match setting being bound to the window,
winresizer's window moving should care it.

How to Repro

:e a                                    " Open file a
:i
file a
hoge
fuga
.
:match Search /hoge/                    " file a: Highlight `hoge`

:below vnew b                           " Open file b
:i
file b
hoge
fuga
.
:match Search /fuga/                    " file b: Highlight `fuga`

<Ctrl-E>
m
h                                       " Exchange file a and b windo position

" Now `:match` highlight is correctly kept in new window position.
"
" Without this fix, `:match` highlight is not replaced correctly:
" it is bound to the window, not buffer.