Remove "highbright bold" conversion. Fixes neovim#11190

When using TUI host terminal should take care of this (regardless
if 'termguicolors' is active or not). For GUI the behavior doesn't make
sense (GUI should display bold attr as bold always).

Author: bfredl

src/nvim/terminal.c

@@ -220,8 +220,6 @@ Terminal *terminal_open(TerminalOptions opts)
   rv->sb_size = (size_t)curbuf->b_p_scbk;
   rv->sb_buffer = xmalloc(sizeof(ScrollbackLine *) * rv->sb_size);
 
-  vterm_state_set_bold_highbright(state, true);
-
   // Configure the color palette. Try to get the color from:
   //
   // - b:terminal_color_{NUM}