org-faces: Simplify face definitions

org-faces: Simplify face definitions

* lisp/org-faces.el (org-default):
(org-level-1):
(org-level-2):
(org-level-3):
(org-level-4):
(org-level-5):
(org-level-6):
(org-level-7):
(org-level-8):
(org-special-keyword):
(org-drawer):
(org-column):
(org-column-title):
(org-agenda-column-dateline):
(org-warning):
(org-archived):
(org-link):
(org-date-selected):
(org-todo):
(org-done):
(org-agenda-done):
(org-headline-done):
(org-priority):
(org-table):
(org-formula):
(org-code):
(org-meta-line):
(org-document-info-keyword):
(org-block):
(org-verbatim):
(org-clock-overlay):
(org-agenda-structure):
(org-agenda-clocking):
(org-agenda-date-weekend):
(org-scheduled):
(org-scheduled-today):
(org-scheduled-previously):
(org-upcoming-deadline):
(org-agenda-restriction-lock):
(org-agenda-filter-tags):
(org-agenda-filter-regexp):
(org-agenda-filter-category):
(org-time-grid):
(org-agenda-diary):
(org-agenda-calendar-event):
(org-agenda-calendar-sexp):
(org-macro):
(org-tag-group): Eschew `org-compatible-face' usage.

Also use lexical binding.