Fix class inheritance

front/src/components/channels/SubscribeButton.vue

@@ -9,7 +9,7 @@
     <translate translate-context="Content/Track/*/Verb">Subscribe</translate>
     <login-modal
       ref="loginModal"
-      class="tiny"
+      class="small"
       :nextRoute='this.$route.fullPath'
       :message='this.message.authMessage'
       :cover='this.channel.artist.cover'

front/src/components/common/LoginModal.vue

 <template>
-    <modal class="small" :show.sync="show">
+    <modal :show.sync="show">
       <h4 class="header">{{ labels.header }}</h4>
-      <div v-if="!cover" class="image content">
+      <div v-if="cover" class="image content">
         <div class="ui medium image">
           <img :src="cover.urls.medium_square_crop">
         </div>