nvim: remove duplicate <leader>lf LSP format binding

Conform's keybind in editing.lua already handles manual format for all
filetypes; the buffer-local LSP binding on LspAttach was shadowing it.

dot_config/nvim/lua/autocmds.lua

@@ -68,7 +68,6 @@ vim.api.nvim_create_autocmd("LspAttach", {
     map("gd", vim.lsp.buf.definition,      "Go to definition")
     map("gi", vim.lsp.buf.implementation,  "Go to implementation")
     map("<leader>D", vim.lsp.buf.type_definition, "Type definition")
-    map("<leader>lf", function() vim.lsp.buf.format({ async = true }) end, "Format")
     map("<leader>lr", vim.lsp.buf.rename,  "Rename symbol")
     map("<leader>ls", vim.lsp.buf.document_symbol, "Document symbols")
     map("<leader>lR", vim.lsp.buf.references, "References")