Fix typo in insert mode keybindings

lua/keymappings.lua

@@ -18,9 +18,9 @@ local default_keys = {
     { "<A-j>", "<Esc>:m .+1<CR>==gi" },
     { "<A-k>", "<Esc>:m .-2<CR>==gi" },
     -- navigation
-    { "<A-Up>", "<C-\\><C-N><C-w>h" },
+    { "<A-Up>", "<C-\\><C-N><C-w>k" },
     { "<A-Down>", "<C-\\><C-N><C-w>j" },
-    { "<A-Left>", "<C-\\><C-N><C-w>k" },
+    { "<A-Left>", "<C-\\><C-N><C-w>h" },
     { "<A-Right>", "<C-\\><C-N><C-w>l" },
   },