[web-src] Use kebap-case for events

Otherwise ESLint will report errors

web-src/src/components/ModalDialogAddRss.vue

@@ -60,7 +60,7 @@ export default {
       this.loading = true
       webapi.library_add(this.url).then(() => {
         this.$emit('close')
-        this.$emit('podcast_added')
+        this.$emit('podcast-added')
         this.url = ''
       }).catch(() => {
         this.loading = false

web-src/src/components/ModalDialogAlbum.vue

@@ -131,7 +131,7 @@ export default {
 
     mark_played: function () {
       webapi.library_album_track_update(this.album.id, { play_count: 'played' }).then(({ data }) => {
-        this.$emit('play_count_changed')
+        this.$emit('play-count-changed')
         this.$emit('close')
       })
     },

web-src/src/components/ModalDialogTrack.vue

@@ -158,14 +158,14 @@ export default {
 
     mark_new: function () {
       webapi.library_track_update(this.track.id, { play_count: 'reset' }).then(() => {
-        this.$emit('play_count_changed')
+        this.$emit('play-count-changed')
         this.$emit('close')
       })
     },
 
     mark_played: function () {
       webapi.library_track_update(this.track.id, { play_count: 'increment' }).then(() => {
-        this.$emit('play_count_changed')
+        this.$emit('play-count-changed')
         this.$emit('close')
       })
     }

web-src/src/pages/PagePodcast.vue

@@ -40,14 +40,14 @@
         :show="show_details_modal"
         :track="selected_track"
         @close="show_details_modal = false"
-        @play_count_changed="reload_tracks" />
+        @play-count-changed="reload_tracks" />
       <modal-dialog-album
         :show="show_album_details_modal"
         :album="album"
         :media_kind="'podcast'"
         :new_tracks="new_tracks"
         @close="show_album_details_modal = false"
-        @play_count_changed="reload_tracks"
+        @play-count-changed="reload_tracks"
         @remove_podcast="open_remove_podcast_dialog" />
       <modal-dialog
         :show="show_remove_podcast_modal"

web-src/src/pages/PagePodcasts.vue

@@ -32,7 +32,7 @@
             </a>
           </template>
         </list-item-track>
-        <modal-dialog-track :show="show_track_details_modal" :track="selected_track" @close="show_track_details_modal = false" @play_count_changed="reload_new_episodes" />
+        <modal-dialog-track :show="show_track_details_modal" :track="selected_track" @close="show_track_details_modal = false" @play-count-changed="reload_new_episodes" />
       </template>
     </content-with-heading>
 
@@ -53,13 +53,13 @@
       </template>
       <template slot="content">
         <list-albums :albums="albums.items"
-            @play_count_changed="reload_new_episodes()"
+            @play-count-changed="reload_new_episodes()"
             @podcast-deleted="reload_podcasts()">
         </list-albums>
         <modal-dialog-add-rss
             :show="show_url_modal"
             @close="show_url_modal = false"
-            @podcast_added="reload_podcasts()" />
+            @podcast-added="reload_podcasts()" />
       </template>
     </content-with-heading>
   </div>