unicode_norm_gen.tmpl: Remove indicator

* template/unicode_norm_gen.tmpl: Remove indicator for
  "frozen_string_literal: true", as r52526.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53577 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

template/unicode_norm_gen.tmpl

@@ -152,7 +152,7 @@ end
 
 # generate normalization tables file
 %># coding: us-ascii
-# -*- frozen_string_literal: true -*-
+# frozen_string_literal: true
 %# >
 
 # automatically generated by template/unicode_norm_gen.tmpl