[FIX] web_editor: table insertion in mobile

Before this commit:

In mobile view, the user was unable to select the table size form table
table picker, making table picker of no use.

After this commit:

In mobile view, the picker will not be visible visible and when the user will
write '/table' then a table of 3x3 dimension will automatically be inserted
without displaying the table picker.

Task id: 3283083

closes odoo/odoo#119806

Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>