demlo: Fix tag-const loading

.config/demlo/config.lua

@@ -51,4 +51,4 @@ Process = false
 -- made by 'tag', so we name the scripts with a prefix number so that 'tag' is
 -- run before 'path'.
 Scripts = {'10-tag-normalize', '15-tag-disc_from_path', '20-tag-replace', '30-tag-case', '40-tag-punctuation', '50-encoding', '60-path', '70-cover',
-	'00-const', '51-encoding-flac2ogg', '59-humour'}
+	'00-tag-const', '51-encoding-flac2ogg', '59-humour'}

.config/demlo/scripts/00-tag-const.lua

@@ -1,4 +1,9 @@
 -- Constants
+help([[
+Custom tags to leave untouched.
+
+See `demlo -h tag-case` for more details.
+]])
 
 const = const or {}