Merge pull request #5099 from opf/fix/interactive_table_header_width

fix having the column spacer play a role in the column width calculation

app/assets/stylesheets/content/_table.sass

@@ -203,10 +203,10 @@ table.generic-table
       background:   #f8f8f8
 
   .generic-table--column-spacer
+    white-space:  nowrap
     padding:      0 6px
     visibility:   hidden
     height:       0px
-    font-size:    0px
     line-height:  0px
 
   .generic-table--sort-header

frontend/app/components/common/interactive-table/interactive-table.directive.ts

@@ -109,7 +109,7 @@ export class interactiveTableController {
 
   private cloneSpacer() {
     this.getHeadersFooters().each((i, el) => {
-      var element = angular.element(this);
+      var element = angular.element(el);
       var html = element.text();
       var hiddenForSighted = element.find('.hidden-for-sighted').text();