Bug 1462625 - Fix TypeError when selecting buildbot jobs (#3561)
Bug 1462625 - Fix TypeError when selecting buildbot jobs (#3561)

This was changed from `_.findIndex()` to `Array.prototype.findIndex()`
in #3537, however was using the former's `_.matches()` shorthand
style, which isn't supported by the ES6 equivalent.

https://lodash.com/docs#findIndex
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndex
KWierso/treeherder,edmorley/treeherder,edmorley/treeherder,KWierso/treeherder,KWierso/treeherder,edmorley/treeherder,KWierso/treeherder,edmorley/treeherder