TT-1304: Remove is_loa1 and is_loa2 controller helper methodso
TT-1304: Remove is_loa1 and is_loa2 controller helper methodso

Methods now uneccessary as controllers no longer have loa1/loa2
distinguishing logic

Author: da39a3ee5e6b4b0d3255bfef95601890afd80709@NasAshrafThoughtworks

alphagov/verify-frontend,alphagov/verify-frontend,alphagov/verify-frontend,alphagov/verify-frontend