Mesh Sky\d\Sky_Ex_Red_Door_01.nif and derivatives need mirrored alts

[riegern]

Mesh Sky\d\Sky_Ex_Red_Door_01.nif (T_Rga_SetReach_Door_01 in CS) and derivatives need mirrored alternatives. As is, all of these doors only have a handle on the right side, meaning none of the int doors can really match their ext counterparts.