MINOR: Replace deprecated lookAt API usage in the app generator

[ninok]

No description provided.

[codecov]

Codecov Report

Merging #1804 into master will increase coverage by 0.19%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1804      +/-   ##
==========================================
+ Coverage   64.30%   64.50%   +0.19%     
==========================================
  Files         285      285              
  Lines       25526    25526              
  Branches     5728     5728              
==========================================
+ Hits        16415    16465      +50     
+ Misses       9111     9061      -50     

Impacted Files	Coverage Δ
...here/harp-mapview/lib/text/TextElementsRenderer.ts	69.88% <0.00%> (+1.10%)	⬆️
@here/harp-mapview/lib/MapView.ts	67.88% <0.00%> (+1.26%)	⬆️
...ere/harp-mapview/lib/composing/LowResRenderPass.ts	44.23% <0.00%> (+3.84%)	⬆️
@here/harp-mapview/lib/CameraMovementDetector.ts	90.14% <0.00%> (+28.16%)	⬆️

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