Fix some new eslint rules

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

js/src/components/Account/PopoverActorCard.vue

@@ -6,7 +6,7 @@
     :class="{ inline, clickable: actor && actor.type === ActorType.GROUP }"
   >
     <slot></slot>
-    <template slot="popover" class="popover">
+    <template slot="popover">
       <actor-card :full="true" :actor="actor" :popover="true" />
     </template>
   </v-popover>

js/src/components/NavBar.vue

@@ -82,11 +82,7 @@
         tag="span"
         @keyup.enter="toggleMenu"
       >
-        <template
-          slot="label"
-          v-if="currentActor"
-          class="navbar-dropdown-profile"
-        >
+        <template slot="label" v-if="currentActor">
           <div class="identity-wrapper">
             <div>
               <figure class="image is-32x32" v-if="currentActor.avatar">

js/src/views/Event/Event.vue

@@ -83,7 +83,7 @@
                 @cancel-anonymous-participation="cancelAnonymousParticipation"
               />
               <div class="has-text-right">
-                <template class="visibility" v-if="!event.draft">
+                <template v-if="!event.draft">
                   <p v-if="event.visibility === EventVisibility.PUBLIC">
                     {{ $t("Public event") }}
                     <b-icon icon="earth" />