Fix tab/shift-tab key bindings for fzf-lua

plugin/holtrop.lua

@@ -12,6 +12,12 @@ require('fzf-lua').setup({
       vertical = 'down:50%',
     },
   },
+  keymap = {
+    fzf = {
+      ["tab"] = "down",
+      ["shift-tab"] = "up",
+    },
+  },
 })
 
 -- Show titlestring in GUI window title