fix(lib): doom/reload-theme not reloading active theme

Rather than reloading whatever `doom-theme` is set to, reload the
currently active theme(s). Although `load-theme` is advised to change
the value of `doom-theme`, not all theme switching commands use
`load-theme` (e.g. `consult-theme`).

Fix #5539

core/autoload/themes.el

@@ -54,11 +54,20 @@ doom-themes' API without worry."
 
 ;;;###autoload
 (defun doom/reload-theme ()
-  "Reload the current color theme."
+  "Reload the current Emacs theme."
   (interactive)
+  (unless doom-theme
+    (user-error "No theme is active"))
   (let ((themes (copy-sequence custom-enabled-themes)))
-    (load-theme doom-theme t)
+    (mapc #'disable-theme custom-enabled-themes)
+    (let (doom-load-theme-hook)
+      (mapc #'enable-theme (reverse themes)))
+    (doom-run-hooks 'doom-load-theme-hook)
     (doom/reload-font)
     (message "%s %s"
-             (propertize "Reloaded themes:" 'face 'bold)
+             (propertize
+              (format "Reloaded %d theme%s:"
+                      (length themes)
+                      (if (cdr themes) "s" ""))
+              'face 'bold)
              (mapconcat #'prin1-to-string themes ", "))))