Apply the same fix to Embeds plugin

Author: patrinhani-ciandt

src/js/embeds.js

@@ -511,7 +511,10 @@
             return;
         }
 
-        $('body').append(this.templates['src/js/templates/embeds-toolbar.hbs']({
+        var mediumEditor = this.core.getEditor();
+        var toolbarContainer = mediumEditor.options.elementsContainer || 'body';
+
+        $(toolbarContainer).append(this.templates['src/js/templates/embeds-toolbar.hbs']({
             styles: this.options.styles,
             actions: this.options.actions
         }).trim());