Templated URL not updating on deletion of Proxy

Overview:

If a Proxy URL string template is deleted, it doesn't result in the removal of the relevant templated URLs from PTIs

Steps to Reproduce:

1. Create a Proxy Server string template (in settings)
2. Check a PTI to see that the templated URL has been created
3. Delete the Proxy URL string template
4. Check the PTI

Expected Results:

Templated URL relevant to the particular proxy server string template is removed
Actual Results:

Templated URL persists on the PTI

Additional Information:
URL:
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Dev task breakdown

It looks like this code finds if string templates have changed, but not if they've been removed.

• Alongside the cursor AppSetting we can include a list of PTI ids
  • Potentially a better storage method than AppSetting. Need global cache in memory, perhaps static. See dashboard implementors example

• Check Set of PTIs in system against Set in memory. If sizes differ refresh all, if not then do .equals() to see if the Sets differ.
• That whole condition can be added to this if clause