Allow remove of banner, avatar images issue #353

Added in new backend API calls to do this.

src/components/user_avatar/user_avatar.js

@@ -8,7 +8,8 @@ const UserAvatar = {
   ],
   data () {
     return {
-      showPlaceholder: false
+      showPlaceholder: false,
+      defaultAvatar: `${this.$store.state.instance.server + this.$store.state.instance.defaultAvatar}`
     }
   },
   components: {
@@ -20,14 +21,12 @@ const UserAvatar = {
     }
   },
   methods: {
+    imgSrc (src) {
+      return (!src || this.showPlaceholder) ? this.defaultAvatar : src
+    },
     imageLoadError () {
       this.showPlaceholder = true
     }
-  },
-  watch: {
-    src () {
-      this.showPlaceholder = false
-    }
   }
 }