Add second safety portal to make Symmetry City symmetrical (#121)

* Update layouts.yaml

added second portal to symmetry city past, to make it symmetrical

* add second portal to symmetry city past

I hope I did this correctly... the ID can just be any number... right?

* duplicate IDs aren't a problem apparently

Author: f-raZ0R

asm/layouts.yaml

@@ -189,6 +189,7 @@ ages:
       db 00,83,00,43,a4 # rock outside D2
       db 03,0f,00,66,f9 # water in d6 past entrance
       db 01,13,00,61,d7 # portal in symmetry city past
+      db 01,13,00,68,d7 # portal in symmetry city past
       db 00,25,00,37,d7 # portal in nuun highlands
       db 05,da,01,a4,b2 # tunnel to moblin keep
       db 05,da,01,a5,b2 # cont.

asm/timeportals.yaml

@@ -144,5 +144,6 @@ ages:
       db dc,05
       db f2
       db e1,00,68,18
+      db e1,00,68,88
       db fe
   12/5e91/: db f3; dw symmetryPortalStaticObjects