Make registration carry flow all the way through

app/controllers/auth/Forms.controller.js

@@ -11,11 +11,21 @@ class Forms extends FormController {
     }
 
     async registration_provider_get(req, res, next) {
+        if ( req.session.auth.flow ) {
+            req.session.registrant_flow = req.session.auth.flow
+        }
+
         return res.page('auth:register', {
             ...this.Vue.data({})
         })
     }
 
+    async finish_registration(req, res, next) {
+        if ( req.trap.has_trap() && req.trap.get_trap() === 'registrant_flow' ) await req.trap.end()
+        const dest = req.session.registrant_flow || '/dash/profile'
+        return res.redirect(dest)
+    }
+
     async login_provider_get(req, res, next) {
         const Setting = this.models.get('Setting')