HARP-15480 Fix colors not being set correctly on custom materials

[nzjony]

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[codecov]

Codecov Report

Merging #2196 (ec326c2) into master (2f10962) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2196   +/-   ##
=======================================
  Coverage   66.64%   66.65%           
=======================================
  Files         312      312           
  Lines       27748    27750    +2     
  Branches     6201     6201           
=======================================
+ Hits        18492    18496    +4     
+ Misses       9256     9254    -2     

Impacted Files	Coverage Δ
@here/harp-mapview/lib/MapMaterialAdapter.ts	92.14% <100.00%> (+0.11%)	⬆️
@here/harp-materials/lib/EdgeMaterial.ts	63.04% <0.00%> (+2.17%)	⬆️

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