[MC-157853] Hover text in books is rendered below the page arrows

When there is a multiline hover text at the bottom of a page in a book, the hover text renders behind the page switching arrows, making the text somewhat unreadable.

Steps to reproduce:

give yourself this book and look at page two:

/give @p minecraft:written_book{title:"Example",author:"Plagiatus",generation:0,pages:['firstpage','[{"text":"secondpage\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n","color":"white"},{"text":"hover over me","color":"blue","bold":true,"hoverEvent":{"action":"show_text","value":{"text":"this\\nis\\nexample\\ntext"}}}]','thirdpage']}