Fix post update tracks bug

Author: staniel359

src/components/containers/forms/post/BasePostCreateFormContainer.vue

@@ -99,13 +99,11 @@ export default {
           trackData.artists
         )
 
-      const artistData = {
-        name: artistName
-      }
-
       return {
         title: trackData.title,
-        artist: artistData
+        artist: {
+          name: artistName
+        }
       }
     },
     formatImage (imageData) {

src/components/containers/forms/post/BasePostUpdateFormContainer.vue

@@ -103,16 +103,15 @@ export default {
     formatTrack (trackData) {
       const artistName =
         formatArtistName(
-          trackData.artists
+          trackData.artists ||
+            [trackData.artist]
         )
 
-      const artistData = {
-        name: artistName
-      }
-
       return {
         title: trackData.title,
-        artist: artistData
+        artist: {
+          name: artistName
+        }
       }
     },
     formatImage (imageData) {