Fix byte-compiler warnings

[skangas]

This fixes two byte-compiler warnings:

Compiling file /home/skangas/wip/emacs-packages/drupal-mode/drupal-mode.el at Sun Jan  9 18:21:47 2022
drupal-mode.el:179:1: Warning: custom-declare-variable
    `drupal-enable-auto-fill-mode' docstring wider than 80 characters
drupal-mode.el:326:1: Warning: defcustom for ‘drupal-style’ fails to specify
    type
drupal-mode.el:326:1: Warning: defcustom for ‘drupal-style’ fails to specify
    type

[arnested]

Thank you, @skangas

[skangas]

Thanks for merging! I have added this package to NonGNU ELPA and it should be available within 24 hours.

[arnested]

Thank you, @skangas !