fetch text height only after mask has been loaded

src/components/update_notification/update_notification.js

@@ -60,9 +60,14 @@ const UpdateNotification = {
     }
   },
   mounted () {
+    // Workaround to get the text height only after mask loaded. A bit hacky.
+    const newImg = new Image()
+    newImg.onload = () => {
       setTimeout(() => {
         this.contentHeight = this.$refs.animatedText.scrollHeight
-    }, 1000)
+      }, 100)
+    }
+    newImg.src = this.pleromaTanVariant === pleromaTan ? pleromaTanMask : pleromaTanFoxMask
   }
 }