adblocker: the library should respect the scriptlet alias in the exception filter

[seia-soto]

Problem

While fixing newser.com (from ghostery/broken-page-reports#720), we identified the scriptlet exceptions were not working.

The list has the following filters:

newser.com##+js(abort-on-stack-trace, Math, onerror)
newser.com##+js(addEventListener-defuser, load, Object)

and the following snippet was used to make exceptions work on Ghostery Browser Extension version 8:

COMMON.modules.adblocker.background.adblocker.manager.engine.updateFromDiff({ added: ['newser.com#@#+js(abort-on-stack-trace, Math, onerror)', 'newser.com#@#+js(addEventListener-defuser, load, Object)'] })

Later, the scriptlet exception never been worked was found by @chrmod. The suggested solution looks like the following:

newser.com#@#+js(aost, Math, onerror)
newser.com#@#+js(aeld, load, Object)

Expected behavior

The adblocker library should respect the scriptlet alias in the exception filter. Thus, the both exception filters should do their jobs.