Removing obsolete reference to lesscpy

The settings file still contains a COMPRESS_PRECOMPILER reference
to lesscpy. With the transition to pyscss, this is no longer
necessary.

Closes-Bug: #1370823
Change-Id: I3baf70a631ef4560570c47d0982c8bc4ee3f8412
Merge "Removing obsolete reference to lesscpy"