Hygiene: Rename escape => regexEscape in most-read-filter.js
Hygiene: Rename escape => regexEscape in most-read-filter.js

This will help prevent its being confused with the native global escape()
function.

Change-Id: I39a0b8cfb43d619d183403b0b889fd0dbb9a3c6a

wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps