Make return button go back to the previous page instead of jump to th…

…e first.

core/frontend/src/components/wizard/Wizard.vue

@@ -141,7 +141,7 @@
             <v-row class="pa-5">
               <v-btn
                 color="warning"
-                @click="step_number = 1"
+                @click="step_number = Math.max(step_number - 1, 1)"
               >
                 Return
               </v-btn>