refactor: undeprecate fzf-lua config (#97)

Instead of encouraging people to register fzf-lua ui_select manually, we
can just call into it. I found a way to pass in config options (which
was the sticking point previously). Doing it this way preserves the rest
of the dressing functionality (e.g. get_config)

lua/dressing/config.lua

@@ -88,6 +88,14 @@ local default_config = {
       },
     },
 
+    -- Options for fzf-lua
+    fzf_lua = {
+      -- winopts = {
+      --   height = 0.5,
+      --   width = 0.5,
+      -- },
+    },
+
     -- Options for nui Menu
     nui = {
       position = "50%",

lua/dressing/select/fzf_lua.lua

@@ -5,13 +5,13 @@ M.is_supported = function()
 end
 
 M.select = function(config, items, opts, on_choice)
-  if config then
-    vim.notify_once(
-      "Deprecated: dressing config for fzf_lua has been removed in favor of using the built-in fzf-lua vim.ui.select implementation.\nRemove the fzf_lua key from dressing.setup()",
-      vim.log.levels.WARN
-    )
+  local ui_select = require("fzf-lua.providers.ui_select")
+  if config and not vim.tbl_isempty(config) then
+    -- Registering then unregistering sets the config options
+    ui_select.register(config, true)
+    ui_select.deregister(nil, true, true)
   end
-  return require("fzf-lua.providers.ui_select").ui_select(items, opts, on_choice)
+  return ui_select.ui_select(items, opts, on_choice)
 end
 
 return M