home: vim: update for 'which-key' v3

It complains quite loudly about the legacy mapping syntax.

modules/home/vim/plugin/settings/which-key.lua

@@ -1,2 +1,27 @@
 local wk = require("which-key")
-wk.setup()
+wk.setup({
+    icons = {
+        -- I don't like icons
+        mappings = false,
+        breadcrumb = "»",
+        separator = "➜",
+        group = "+",
+        ellipsis = "…",
+        keys = {
+            Up = " ",
+            Down = " ",
+            Left = " ",
+            Right = " ",
+            C = "<C>",
+            M = "<M>",
+            D = "<D>",
+            S = "<S>",
+            CR = "<CR>",
+            Esc = "<Esc> ",
+            NL = "<NL>",
+            BS = "<BS>",
+            Space = "<space>",
+            Tab = "<Tab> ",
+        },
+    },
+})