Align mail mode select buttons to right

aleksis/apps/paweljong/frontend/components/event_registration/EventRegistrationForm.vue

@@ -111,6 +111,7 @@ import SecondaryActionButton from "aleksis.core/components/generic/buttons/Secon
                   </v-card-text>
                   <v-card-actions>
                     <v-row>
+                      <v-spacer />
                       <v-col>
                         <primary-action-button
                           @click="emailMode = 'postbuero'"