restrict opacity form to polygon or not default selector

src/components/FeatureType/SymbologySelector.vue

@@ -14,7 +14,7 @@
           :name="form.color.html_name"
         >
       </div>
-      <div v-if="geomType === 'polygon'">
+      <div v-if="geomType === 'polygon' || title !== 'Symbologie par défault :'">
         <label>Opacité &nbsp;<span>(%)</span></label>
         <div class="range-container">
           <input