handle warning re. tableModal update, seen in testing

blast-results.{js,hbs} : add setTableModal() to set tableModal in later(), to avoid warning :  attempted to update tableModal, but it had already been used previously in the same computation.

frontend/app/components/panel/upload/blast-results.js

@@ -2,6 +2,7 @@ import Component from '@ember/component';
 import { observer, computed } from '@ember/object';
 import { inject as service } from '@ember/service';
 import { alias } from '@ember/object/computed';
+import { later as run_later } from '@ember/runloop';
 
 import uploadBase from '../../../utils/panel/upload-base';
 import uploadTable from '../../../utils/panel/upload-table';
@@ -53,6 +54,9 @@ export default Component.extend({
 
   /*--------------------------------------------------------------------------*/
 
+  setTableModal(isModal) {
+    run_later(() => this.set('tableModal', isModal));
+  },
   tableModalTargetId : computed('tableModal', function () {
     return this.get('tableModal') ? 'blast-results-table-modal' : 'blast-results-table-panel';
   }),

frontend/app/templates/components/panel/upload/blast-results.hbs

@@ -22,7 +22,7 @@
     {{#if this.tableModal}}
       {{#ember-modal-dialog  title="Blast Results" header-icon='list'}}
         <button
-         onclick={{action (mut this.tableModal)  false}}
+         onclick={{action this.setTableModal false}}
          style="float: right; position: relative; top: -12px;" class="close"
          type="button">x
         </button>
@@ -34,7 +34,7 @@
         {{#elem/button-base
         classSize='xs'
         classColour='default'
-        click=(action (mut this.tableModal)  true )
+        click=(action this.setTableModal  true )
         icon='new-window'}}
 
           {{#ember-tooltip side="left" delay=500}}