Protobuf generation: Correctly include $ ASCII_36 token (#219)

This was accidentally only modified in the output file, not in the
generation logic itself.

scripts/generate_protobuf_and_funcs.rb

@@ -410,6 +410,7 @@ def generate!
   // Single-character tokens that are returned 1:1 (identical with \"self\" list in scan.l)
   // Either supporting syntax, or single-character operators (some can be both)
   // Also see https://www.postgresql.org/docs/12/sql-syntax-lexical.html#SQL-SYNTAX-SPECIAL-CHARS
+  ASCII_36 = 36; // \"$\"
   ASCII_37 = 37; // \"%\"
   ASCII_40 = 40; // \"\(\"
   ASCII_41 = 41; // \")\"