Wrong assignment of flag `N` in locale de-CH

[lauft]

Describe the bug
The following holidays either have flag N (i.e. are national holidays) but have regions defined, or have no regions defined but lack the flag N.

• Which holidays are affected?

  05-01: [BL,BS,GR,NE,SH,TG,TI,ZH] [NF] Tag der Arbeit
  12-25: [RF] Weihnachtstag
  2 days before Easter: [AG,AI,AR,BE,BL,BS,FR,GE,GL,GR,JU,LU,NE,NW,OW,SG,SH,SO,SZ,TG,UR,VD,ZG,ZH] [NRV] Karfreitag
  1 day after Easter: [AI,AR,BE,BL,BS,GE,GL,GR,JU,SG,SH,SZ,TG,TI,UR,VD,ZH] [NRV] Ostermontag
  39 days after Easter: [RV] Auffahrt
  49 days after Easter: [RV] Pfingstsonntag

• Which years does the bug affect? All years

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