remove shift - x from buffer line (#1073)

fixes issue https://github.com/ChristianChiarulli/LunarVim/issues/1053

lua/core/bufferline.lua

@@ -1,4 +1,3 @@
-vim.api.nvim_set_keymap("n", "<S-x>", ":BufferClose<CR>", { noremap = true, silent = true })
 vim.api.nvim_set_keymap("n", "<S-l>", ":BufferNext<CR>", { noremap = true, silent = true })
 vim.api.nvim_set_keymap("n", "<S-h>", ":BufferPrevious<CR>", { noremap = true, silent = true })
 vim.api.nvim_set_keymap("n", "<leader>c", ":BufferClose<CR>", { noremap = true, silent = true })