Fix terminal detection

init.vim

@@ -8,7 +8,8 @@ runtime platform.vim
 if g:platform ==? "linux"
     "autocmd VimLeave * set guicursor=a:ver35-blinkon0
     "set guicursor=
-    if $TERM ==? "alacritty"
+    let supported_terminals=["alacritty", "st-256color", "xterm-256color", "screen"]
+    if index(supported_terminals, $TERM) != -1
         set termguicolors
     else
         set notermguicolors
@@ -19,6 +20,7 @@ elseif g:platform ==? "xterm"
     set notermguicolors
     set guicursor=
     set t_Co=
+    autocmd ColorScheme dracula hi Visual cterm=reverse
 else
     set termguicolors
 endif