[web/app.js] Remove the remaining zoomDisabledTimeout usage?

[Snuffleupagus]

With the primary use-case for the zoomDisabledTimeout functionality being removed in PR #17724, I wonder if we could get rid of the rest of this code now?
The remaining code was added in PR #10351 to work-around bug 1503412, but without access to a Mac I cannot tell if we still need that and if so whether it's possible to refactor it to remove the setTimeout-based hack?

/cc @calixteman The following patch simply removes the affected code, would you be able to test it on Mac?
master...Snuffleupagus:pdf.js:rm-setZoomDisabledTimeout

[calixteman]

Unfortunately, the bug is still there.
This is a Firefox issue and I filed https://bugzilla.mozilla.org/show_bug.cgi?id=1882168.