Regional holidays marked as national in locale de-DE

[lauft]

Describe the bug
The following holidays have flag N (i.e. are national holidays) but have regions defined.

• Which holidays are affected?

  01-06: [BW,BY,ST] [NRF] Heilige drei Könige
  08-15: [SL] [NRF] Mariä Himmelfahrt
  11-01: [BW,BY,NW,RP,SL] [NRF] Allerheiligen
  60 days after Easter: [BW,BY,HE,NW,RP,SL] [NRV] Fronleichnam
  11 days before 4. sunday before 12-25: [SN] [NRV] Buß- und Bettag
  10-31: [*] [NRF] Reformationstag*
  03-08: [BE] [NF] Frauentag
  2020-05-08: [BE] [NF] 75. Jahrestag der Befreiung vom Nationalsozialismus und der Beendigung des Zweiten Weltkrieges in Europa
  

  *Holiday "Reformationstag" is a national holiday only in 2017
• Which years does the bug affect?
  All years

Expected behavior
If a holiday has regions defined, it should not have flag N.