Commands executed from a book in a lectern use entity's coordinates

When executing a command from a book inside a lectern, instead of executing it in the coordinates of the lectern, it uses the coordinates of the entity reading the book, unlike when executing commands from a sign that uses the coordinates of the sign.

This bug makes it more difficult to use the lectern for mapmakers to use it as a fixed point to calculate relative coordinates.

To reproduce

Steps to reproduce:

1. Place a lectern containing a written book with a "run_command" clickEvent:

   /setblock ~ ~ ~ lectern[has_book=true]{Book:{id:"minecraft:written_book",count:1,components:{"minecraft:written_book_content":{title:"",author:"",pages:['{"text":"Test","clickEvent":{"action":"run_command","value":"/setblock ~ ~3 ~ stone"}}']}}},Page:1} replace

1. Open the book on the lectern while standing a short distance away from it
2. Click on the word "Test"
   → A block of stone is placed above your head (rather than above the lectern)