Debian: fix HeeksCAD package description
Debian: fix HeeksCAD package description

Reported by litian: 
E: heekscad: description-starts-with-package-name
W: heekscad: extended-description-line-too-long
W: heekscad: extended-description-line-too-long

FluffyMortain/heekscad,Powerino73/heekscad,tbinias/heekscad,thojongle/heekscad,DINKIN/heekscad,Powerino73/heekscad,tectronics/heekscad,namoamitof/heekscad,singwina/heekscad,pyrotron/heekscad,tbinias/heekscad,singwina/heekscad,singwina/heekscad,thojongle/heekscad,AlanZheng/heekscad,Nurb432/heekscad,tectronics/heekscad,thojongle/heekscad,FluffyMortain/heekscad,pyrotron/heekscad,pyrotron/heekscad,tectronics/heekscad,Nurb432/heekscad,pyrotron/heekscad,DINKIN/heekscad,ahmetsemihparlak/heekscad,namoamitof/heekscad,DINKIN/heekscad,tbinias/heekscad,Nurb432/heekscad,Nurb432/heekscad,ahmetsemihparlak/heekscad,FluffyMortain/heekscad,tectronics/heekscad,singwina/heekscad,AlanZheng/heekscad,FluffyMortain/heekscad,thojongle/heekscad,Powerino73/heekscad,DINKIN/heekscad,AlanZheng/heekscad,ahmetsemihparlak/heekscad,tbinias/heekscad,ahmetsemihparlak/heekscad,namoamitof/heekscad,Powerino73/heekscad,namoamitof/heekscad,AlanZheng/heekscad