Ctrl+A inside table cell should only select all of the cell's content instead of the whole document.

Describe the bug Ctrl+A usually only selects the current cell content if the user is inside a table instead of selecting the whole document

To Reproduce Steps to reproduce the behavior:

1. Create a new table
2. Create some cells with text content
3. Enter a cell and press Ctrl+A

Expected behavior Only the text inside the cell should be selected.

Server details:

• Nextcloud version: 28.0.4
• PHP Version: 8.3
• Database: PostgreSQL 15

Client details:

• OS: Arch Linux
• Browser: Firefox
• Browser version: 125.0.3
• Device: Desktop