Unify smoothing distance across isochrone algorithms

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Problem description

Currently, each of the two different isochrone algorithms has its own default value of smoothing distance.

1333 m for regular isochrones

openrouteservice/ors-engine/src/main/java/org/heigit/ors/isochrones/builders/concaveballs/ConcaveBallsIsochroneMapBuilder.java

Line 212 in c22b008

// Use a default length (~1333m)

vs. 1000 m for fast isochrones.

openrouteservice/ors-engine/src/main/java/org/heigit/ors/isochrones/builders/fast/FastIsochroneMapBuilder.java

Line 394 in c22b008

// Use a default length (~1000m)

Proposed solution

Have the same default value for both algorithms.

Additional context

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