can't rely on "used" flag from EACS

 - used flag applies to live DAQs not configuration being prepared, it
   feels more natural to use configuration being prepared.

www/src/components/Cards/DaqCard.vue.js

 // @ts-check
 import Vue from "vue";
 import d from 'debug';
-import { every, forEach, get, map, toNumber } from 'lodash';
+import { every, forEach, get, map, some, toNumber } from 'lodash';
 import { mapState } from 'vuex';
 import Channel from './Channel.vue';
 import {
@@ -60,7 +60,8 @@ const component = /** @type {V.Constructor<typeof options, Refs>} */ (Vue).exten
    *   sampleSize: number ,
    *   delay: number ,
    *   maxEditTimeWindow: number,
-   *   isLoading: boolean
+   *   isLoading: boolean,
+   *   isUsed: boolean
    * }}
    */
   data() {
@@ -69,7 +70,8 @@ const component = /** @type {V.Constructor<typeof options, Refs>} */ (Vue).exten
       sampleSize: 0,
       delay: 0,
       maxEditTimeWindow: 0,
-      isLoading: true
+      isLoading: true,
+      isUsed: false
     };
   },
   computed: {
@@ -79,11 +81,11 @@ const component = /** @type {V.Constructor<typeof options, Refs>} */ (Vue).exten
     })),
     /** @return {boolean} */
     showAcq() {
-      return (this.acqExpanded === "all") || (this.acqExpanded && this.card.used);
+      return (this.acqExpanded === "all") || (!!this.acqExpanded && this.isUsed);
     },
     /** @return {boolean} */
     showZsp() {
-      return (this.zspExpanded === "all") || (this.zspExpanded && this.card.used);
+      return (this.zspExpanded === "all") || (!!this.zspExpanded && this.isUsed);
     },
     /**
      * @this {Instance}
@@ -157,6 +159,7 @@ const component = /** @type {V.Constructor<typeof options, Refs>} */ (Vue).exten
         this.isLoading = false;
         this.$emit('loaded');
         debug('Card loaded %s', this.card.sn);
+        this.isUsed = some(this.$refs.Channels, 'enabled');
       }
     },
     /** @this {Instance} */
@@ -173,10 +176,13 @@ const component = /** @type {V.Constructor<typeof options, Refs>} */ (Vue).exten
     },
     /** @this {Instance} */
     async configure() {
+      let isUsed = false;
       forEach(this.$refs.Channels, (chan) => chan.setSending(true));
       for (const chan of this.$refs.Channels) {
         await (chan).configure();
+        isUsed = isUsed || chan.enabled;
       }
+      this.isUsed = isUsed;
     }
   }
 });