Fix the "Text selection using mouse doesn't jump when hovering on an empty area in a single page" integration test

[timvandermeij]

This integration test consistently fails locally for me on Arch Linux with the following traceback:

Failures:
1) Text layer Text selection using mouse doesn't jump when hovering on an empty area in a single page
  Message:
    In chrome:
        Expected '' to roughly match 'code sequences, records
        them, and compiles them to fast native code. We call suc'.
  Stack:
        at <Jasmine>
        at file:///home/timvandermeij/Documenten/Ontwikkeling/pdf.js/Code/test/integration/text_layer_spec.mjs:138:18
        at async Promise.all (index 1)
        at async UserContext.<anonymous> (file:///home/timvandermeij/Documenten/Ontwikkeling/pdf.js/Code/test/integration/text_layer_spec.mjs:116:11)

I haven't seen this happening on the bots. We should figure out what could cause this.

[nicolo-ribaudo]

I take a look, if I can reproduce it