[vim] revamped somehow broken AirlineTheme command

vim/vimrc

@@ -35,15 +35,15 @@ call plug#end() "Перестать это делать
 "
 set term=xterm-256color
 colorscheme atom-dark-256
-AirlineTheme dark
+let g:airline_theme='dark'
 
 function ToggleColors()
   if (g:colors_name == "atom-dark-256")
     colorscheme antiphoton
-        AirlineTheme light
+    let g:airline_theme='light'
   else
     colorscheme atom-dark-256
-        AirlineTheme dark
+    let g:airline_theme='dark'
   endif
 endfunction