Fix hotkey page up/down does not work

[horner]

#2870

[codecov]

Codecov Report

Merging #2910 (ef944d6) into master (fe57c00) will decrease coverage by 0.72%.
The diff coverage is 2.20%.

@@            Coverage Diff             @@
##           master    #2910      +/-   ##
==========================================
- Coverage   12.68%   11.95%   -0.73%     
==========================================
  Files         306      307       +1     
  Lines        8233     8439     +206     
  Branches     1593     1675      +82     
==========================================
- Hits         1044     1009      -35     
- Misses       5797     5947     +150     
- Partials     1392     1483      +91     

Impacted Files	Coverage Δ
...latform/core/src/DICOMSR/SCOORD3D/parseSCOORD3D.js	2.63% <0.00%> (-0.76%)	⬇️
.../core/src/DICOMSR/SCOORD3D/utils/addMeasurement.js	5.40% <ø> (ø)
...re/src/DICOMSR/SCOORD3D/utils/getRenderableData.js	1.72% <0.00%> (-0.07%)	⬇️
platform/core/src/classes/StudyLoadingListener.js	1.03% <0.00%> (+0.01%)	⬆️
...latform/core/src/classes/metadata/StudyMetadata.js	1.25% <0.00%> (-0.04%)	⬇️
.../core/src/measurements/tools/dicomSRDisplayTool.js	50.00% <0.00%> (ø)
.../src/studies/services/wado/studyInstanceHelpers.js	1.56% <0.00%> (-0.48%)	⬇️
platform/core/src/utils/StackManager.js	11.62% <0.00%> (ø)
...m/core/src/utils/loadAndCacheDerivedDisplaySets.js	0.00% <0.00%> (ø)
...Extensions/GenericViewerCommands/commandsModule.js	0.00% <ø> (ø)
... and 22 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ddfde92...ef944d6. Read the comment docs.