fix: remove getEpochTime from OidcClientSettings
fix: remove getEpochTime from OidcClientSettings

OidcClientSettings (in OidcClientSettings.js) doesn't appear to accept
that in its contructor.

This should also address https://github.com/IdentityModel/oidc-client-js/pull/1271#issuecomment-769877657

IdentityModel/oidc-client,IdentityModel/oidc-client-js,IdentityModel/oidc-client,IdentityModel/oidc-client-js,IdentityModel/oidc-client-js,IdentityModel/oidc-client