Cesium3DTileset constructor ignores some dynamicScreenSpaceError options

[ptrgags]

While setting up performance tests for dynamicScreenSpaceError (needed for #4196), I discovered that the parameters I passed into the Cesium3DTileset constructor options were doing nothing.

On inspecting the code, the options like dynamicScreenSpaceErrorFactor are ignored and just hard-coded as 4.

The fix is to just make sure the option gets propagated with defaultValue(option, default) as usual.

Note that this is distinct from #6143 which is about one of these parameters not propagated correctly in the 3D Tiles Inspector.

[ptrgags]

Also such an update would be a good time to improve the documentation for these parameters. see #4196 (comment) for some initial thoughts.

[Saicbmm]

Yes, I believe the fact that the dynamicScreenSpaceErrorFactor option was hardcoded led to the constructor option not doing anything because it wasn't taking any input.