Image Annotation Tool: Fixes _isOpenSeaDragon function
Annotation Tools: Pylint Fix left over from previous PR
Annotation Tools: Non-critical highlights == undefined fixes

i.e. they should be fixed but don’t cause the whole thing to break.

 - PR fixes

 - Reverted Fix
Merge pull request #5305 from lduarte1991/lduarte-harvardx-pr28

Fixes check for Image Annotation Tool to include ID from image server and fix scrolling bug