Revert "Add {*} placeholder flag"

This reverts commit 27258f7207.

CHANGELOG.md

@@ -3,11 +3,6 @@ CHANGELOG
 
 0.63.0
 ------
-- Added `{*}` placeholder flag that evaluates to all matched items.
-  ```bash
-  seq 10000 | fzf --preview "awk '{sum += \$1} END {print sum}' {*f}"
-  ```
-  - Use this with caution, as it can make fzf sluggish for large lists.
 - Added background variants of transform actions with `bg-` prefix that run asynchronously in the background
   ```sh
   GETTER='curl -s http://metaphorpsum.com/sentences/1'