Delete statusline setting

It's obsolete and no longer used. Even root doesn't use that setting.

statusline is set currently set by airline.

vimrc

@@ -23,7 +23,6 @@ set showcmd                             " show incomplete commands
 set showmatch                           " show matching brackets when text indicator is over them
 set signcolumn=yes                      " always have the sign column
 "set spell                              " enable spell checking
-set statusline=%<\ %n:%f\ %m%r%y%=%-35.(line:\ %l\ of\ %L,\ col:\ %c%V\ (%P)%)
 set t_Co=256                            " setup colors
 set t_vb=                               " no annoying sound on errors
 set tabstop=4                           " number of visual spaces per TAB