platform/x86: thinkpad_acpi: Move hotkey_user_mask check to tpacpi_input_send_key()

Move hotkey_user_mask check to tpacpi_input_send_key(), this is
a preparation patch for further refactoring.

Tested-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20240424122834.19801-11-hdegoede@redhat.com