Fix jsunit tests

[juliusknorr]

Seems like the behaviour changed somewhere between sinon version 5.0.1 and the current 5.0.5, but I could not find any reference in the changes.

Anyhow this fixes the jsunit tests in drone again. We should also backport this back to stable13/stable12, as it is broken there as well.

Please review @nextcloud/javascript

[codecov]

Codecov Report

Merging #9407 into master will increase coverage by 0.57%.
The diff coverage is n/a.

@@ Coverage Diff @@## master #9407 +/- ##
============================================
+ Coverage 51.1% 51.68% +0.57% 
Complexity 25654 25654 ============================================
Files 1569 1636 +67 Lines 88234 96176 +7942 Branches 0 1393 +1393 ============================================
+ Hits 45095 49709 +4614 - Misses 43139 46467 +3328

Impacted Files	Coverage Δ	Complexity Δ
core/js/oc-dialogs.js	0.43% <0%> (ø)	0% <0%> (?)
core/js/oc-backbone.js	100% <0%> (ø)	0% <0%> (?)
core/js/config.js	6.66% <0%> (ø)	0% <0%> (?)
core/js/files/client.js	85.26% <0%> (ø)	0% <0%> (?)
core/js/l10n.js	97.29% <0%> (ø)	0% <0%> (?)
core/js/mimetypelist.js	100% <0%> (ø)	0% <0%> (?)
apps/files_sharing/js/public.js	47.91% <0%> (ø)	0% <0%> (?)
core/js/public/appconfig.js	4.76% <0%> (ø)	0% <0%> (?)
core/js/files/fileinfo.js	100% <0%> (ø)	0% <0%> (?)
apps/files_sharing/js/sharetabview.js	86.66% <0%> (ø)	0% <0%> (?)
... and 59 more

[skjnldsv]

Weeee

[juliusknorr]

stable12 #9431
stable13 #9430