fix: multiple selection enabled always visible (#30)

Although I couldn't reproduce #29, this fixes #29. It now truly hides the box while multiple selection isn't activated.

License: MIT
Signed-off-by: Henrique Dias <hacdias@gmail.com>

src/components/files/Listing.vue

@@ -78,7 +78,7 @@
 
     <input style="display:none" type="file" id="upload-input" @change="uploadInput($event)" multiple>
 
-    <div v-show="$store.state.multiple" :class="{ active: $store.state.multiple }" id="multiple-selection">
+    <div :class="{ active: $store.state.multiple }" id="multiple-selection">
     <p>{{ $t('files.multipleSelectionEnabled') }}</p>
       <div @click="$store.commit('multiple', false)" tabindex="0" role="button" :title="$t('files.clear')" :aria-label="$t('files.clear')" class="action">
         <i class="material-icons">clear</i>