daemon/setMounts(): remove dead code
daemon/setMounts(): remove dead code

Since PR 11353 (commit 7804cd36eec45c "Filter out default mounts that
are override by user") there can be no duplicated mounts in the list,
so the check is redundant.

This should speed up container start by a nanosecond or two.

Signed-off-by: Kir Kolyshkin <3a017b8ddb3f9cf3e4a59978b004111bdeb97f08@gmail.com>

KarthikNayak/docker,rremer/moby,bearstech/moby,jameszhan/docker,rremer/moby,djs55/docker,nawawi/docker,cpuguy83/docker,mahak/docker,KarthikNayak/docker,vdemeester/docker,bearstech/moby,jlhawn/docker,gnailuy/docker,kolyshkin/docker,tmp6154/docker,flavio/docker,moby/moby,rancher/docker,yosifkit/docker,jvanz/docker,pradipd/moby,jameszhan/docker,ibuildthecloud/docker,Mokolea/docker,mikebrow/docker,dims/docker,konstruktoid/docker-1,cpuguy83/docker,mikebrow/docker,moby/moby,yosifkit/docker,yongtang/docker,rremer/moby,jwhonce/docker,moul/docker,moby/moby,jvanz/docker,KarthikNayak/docker,kojiromike/docker,trebonian/docker,jimjag/docker,SvenDowideit/docker,moul/docker,laijs/moby,paralin/docker,thaJeztah/docker,justincormack/docker,laijs/moby,dmcgowan/docker,kojiromike/docker,justincormack/docker,mikebrow/docker,konstruktoid/docker-upstream,paralin/docker,kolyshkin/docker,konstruktoid/docker-upstream,nalind/docker,cpuguy83/docker,konstruktoid/docker-upstream,thaJeztah/docker,mahak/docker,Ramzec/docker,bearstech/moby,gnailuy/docker,Ramzec/docker,SvenDowideit/docker,YuPengZTE/docker,ibuildthecloud/docker,YuPengZTE/docker,rancher/docker,kolyshkin/moby,jwhonce/docker,ibuildthecloud/docker,crosbymichael/docker,dims/docker,docker/docker,estesp/docker,laijs/docker,paralin/docker,unclejack/docker,kolyshkin/moby,estesp/docker,jimjag/docker,crosbymichael/docker,ibuildthecloud/docker,maxamillion/docker,x1022as/docker,jlhawn/docker,AkihiroSuda/docker,tmp6154/docker,pradipd/moby,dims/docker,docker/docker,laijs/moby,docker/docker,crosbymichael/docker,scotttlin/docker,unclejack/docker,vdemeester/docker,maxamillion/docker,dmcgowan/docker,flavio/docker,nawawi/docker,jwhonce/docker,nalind/docker,trebonian/docker,unclejack/docker,Ramzec/docker,AkihiroSuda/docker,trebonian/docker,tmp6154/docker,AkihiroSuda/docker,rancher/docker,konstruktoid/docker-1,maxamillion/docker,flavio/docker,paralin/docker,jlhawn/docker,gnailuy/docker,kojiromike/docker,SvenDowideit/docker,yosifkit/docker,djs55/docker,scotttlin/docker,yongtang/docker,yongtang/docker,estesp/docker,jameszhan/docker,thaJeztah/docker,jthelin/docker,laijs/docker,justincormack/docker,AkihiroSuda/docker,kolyshkin/moby,nawawi/docker,jthelin/docker,jimjag/docker,jimjag/docker,ibuildthecloud/docker,konstruktoid/docker-1,YuPengZTE/docker,cpuguy83/docker,jvanz/docker,laijs/docker,x1022as/docker,moby/moby,trebonian/docker,x1022as/docker,scotttlin/docker,moul/docker,pradipd/moby,nalind/docker,dmcgowan/docker,Mokolea/docker,Mokolea/docker,mahak/docker,Ramzec/docker,moul/docker,djs55/docker,vdemeester/docker,flavio/docker,yosifkit/docker,konstruktoid/docker-upstream,Mokolea/docker,nalind/docker,thaJeztah/docker,mahak/docker,gnailuy/docker,bearstech/moby,nawawi/docker