Changes what major modes we exclude from dtrt-indent's auto-detection.
Any mode in doom-detect-indentation-excluded-modes, plus derived modes,
will be excluded instead of only the parent modes.
This indirectly fixes an issue where org-mode derivatives (like
org-journal-mode) have their tab-width changed (#7670), causing the
`org-current-text-column` macro to throw the following error:
Tab width in Org files must be 8, not N. Please adjust your
`tab-width' settings for Org mode.
I opted for this solution instead rather than adding all possibly
derivatives to `doom-detect-indentation-excluded-modes`.
Fix: #7670
Ref: 38dd882685/lisp/org-macs.el (L1154)
3986ee6c2b