Remove unnecessary default max workers
Remove unnecessary default max workers

ProcessPoolExecutor defaults to max cpus.

Fixes https://github.com/coala/coala/issues/4159
Related to https://github.com/coala/coala/issues/3715

netman92/coala,aptrishu/coala,aptrishu/coala,Asalle/coala,coala-analyzer/coala,SanketDG/coala,coala-analyzer/coala,coala-analyzer/coala,Asnelchristian/coala,shreyans800755/coala,Asalle/coala,coala/coala,Asnelchristian/coala,rimacone/testing2,netman92/coala,damngamerz/coala,Nosferatul/coala,RJ722/coala,jayvdb/coala,yashLadha/coala,arjunsinghy96/coala,nemaniarjun/coala,Nosferatul/coala,jayvdb/coala,coala/coala,shreyans800755/coala,coala/coala,refeed/coala,Balaji2198/coala,incorrectusername/coala,rimacone/testing2,Asnelchristian/coala,RJ722/coala,CruiseDevice/coala,SanketDG/coala,rimacone/testing2,Asalle/coala,refeed/coala,arjunsinghy96/coala,karansingh1559/coala,karansingh1559/coala,yashLadha/coala,Nosferatul/coala,MariosPanag/coala,RJ722/coala,CruiseDevice/coala,Balaji2198/coala,refeed/coala,jayvdb/coala,incorrectusername/coala,yashLadha/coala,MariosPanag/coala,nemaniarjun/coala,MariosPanag/coala,incorrectusername/coala,kartikeys98/coala,kartikeys98/coala,SanketDG/coala,kartikeys98/coala,damngamerz/coala,Balaji2198/coala,karansingh1559/coala,nemaniarjun/coala,CruiseDevice/coala,netman92/coala,damngamerz/coala,aptrishu/coala,shreyans800755/coala,arjunsinghy96/coala