Fix vim-mark script for group color key mapping.

- Fix group color search key mapping.
Because <k1>~<k9> key are numeric keyboard.
But I can not use this key. So fix like below.

1. next search:   <k1> ~   <k9> => ,1 ~ ,9
1. prev search: <C-k1> ~ <C-k9> => ;1 ~ ;9