Tweak how we disable grid filter options

hoping to find some magic combo that works for everyone...

tailbone/templates/grids/filters_buefy.mako

@@ -24,7 +24,9 @@
       <option v-for="key in filtersSequence"
               :key="key"
               :value="key"
-              :disabled="filters[key].visible">
+              ## TODO: previous code here was simpler; trying to track down
+              ## why disabled options don't appear so on Windows Chrome (?)
+              :disabled="filters[key].visible ? 'disabled' : null">
         {{ filters[key].label }}
       </option>
     </b-select>