chore(keymap): extract filtering into function

lua/nvim-tree/keymap.lua

@@ -245,12 +245,7 @@ function M.set_keymaps(bufnr)
   end
 end
 
-local function get_keymaps(keys_to_disable)
+local function filter_default_mappings(keys_to_disable)
-  if keys_to_disable == true then
-    return {}
-  end
-
-  if type(keys_to_disable) == "table" and #keys_to_disable > 0 then
   local new_map = {}
   for _, m in pairs(DEFAULT_KEYMAPS) do
     local keys = type(m.key) == "table" and m.key or { m.key }
@@ -276,6 +271,15 @@ local function get_keymaps(keys_to_disable)
   return new_map
 end
 
+local function get_keymaps(keys_to_disable)
+  if keys_to_disable == true then
+    return {}
+  end
+
+  if type(keys_to_disable) == "table" and #keys_to_disable > 0 then
+    return filter_default_mappings(keys_to_disable)
+  end
+
   return DEFAULT_KEYMAPS
 end