Delete the previews when a version is restored

[rullzer]

Fixes #9469

When a version of a file is restored the previews are no longer valid.
Thus we should remove them so they are regenerated.

Signed-off-by: Roeland Jago Douma roeland@famdouma.nl

[codecov]

Codecov Report

Merging #9475 into master will increase coverage by <.01%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##             master    #9475      +/-   ##
============================================
+ Coverage     51.71%   51.72%   +<.01%     
- Complexity    25696    25699       +3     
============================================
  Files          1640     1640              
  Lines         96337    96346       +9     
  Branches       1393     1393              
============================================
+ Hits          49823    49833      +10     
+ Misses        46514    46513       -1

Impacted Files	Coverage Δ	Complexity Δ
apps/files_versions/lib/Storage.php	66.32% <100%> (+0.25%)	103 <0> (ø)	⬇️
lib/private/Preview/WatcherConnector.php	91.66% <100%> (+0.75%)	5 <0> (ø)	⬇️
lib/private/Preview/Watcher.php	64.28% <40%> (-13.5%)	7 <5> (+3)
apps/files_trashbin/lib/Expiration.php	90.32% <0%> (-1.62%)	29% <0%> (ø)
core/js/js.js	65.96% <0%> (+0.55%)	0% <0%> (ø)	⬇️

[MorrisJobke]

Tested and works 👍