[ews-app] Rename patch_id field to change_id in ews django app.
Pull request: https://github.com/WebKit/WebKit/pull/2362
Committed 252412@main (2a133cc5b176): <https://commits.webkit.org/252412@main> Reviewed commits have been landed. Closing PR #2362 and removing active labels.
<rdar://problem/96954156>