Change folder browser to respect depth (#420)

* Change folder browser to respect depth

I think the folder browser should respect the depth option. I'm currently trying to build a project selector in my nvim, and I need the folder browser to respect the depth if my project select is going to be useful.

* simplify and remove dead code

* Update finders.lua

Author: henryxparker

lua/telescope/_extensions/file_browser/finders.lua

@@ -156,6 +156,7 @@ fb_finders.browse_folders = function(opts)
       hidden = hidden_opts(opts),
       only_dirs = true,
       respect_gitignore = opts.respect_gitignore,
+      depth = opts.depth,
     })
     table.insert(data, 1, cwd)
     return finders.new_table { results = data, entry_maker = entry_maker }