Remove dialog templates from body on destroy, using options.dialogsInBody

[mstred]

What's this PR do?

• removes modal templates generated in document.body, when using options.dialogsInBody attribute as defined in Apply modal dialogs into document.body #1175.

Where should the reviewer start?

• src/js/Renderer.js (added conditional function call to remove .note-dialog template div based on options.dialogsInBody definition in summernote's settings)

How should this be manually tested?

1. In an editor instance, try to execute a destroy() call to summernote;
2. Assert if the element with dialog templates was properly removed from document.body, as expected to that function behavior

Any background context you want to provide?

This is just a missed code snippet in #1175 PR. Sorry to create another one, folks.

What are the relevant tickets?

#1175

[mstred]

Thanks, @hackerwins.
😄

[hackerwins]

@mstred 👍