command/format: Don't include commas after elements in map diffs
command/format: Don't include commas after elements in map diffs

Although commas are allowed in this context, it's not idiomatic to use
them.

drebes/terraform,mattray/terraform,hashicorp/terraform,heimweh/terraform,tpounds/terraform,youhong316/terraform,pdecat/terraform,pradeepbhadani/terraform,mattray/terraform,nlamirault/terraform,apparentlymart/terraform,iljaskevic/terraform,hashicorp/terraform,tommynsong/terraform,gechr/terraform,gechr/terraform,apparentlymart/terraform,youhong316/terraform,pryorda/terraform,VladRassokhin/terraform,pdecat/terraform,drebes/terraform,VladRassokhin/terraform,youhong316/terraform,rnaveiras/terraform,mattray/terraform,apparentlymart/terraform,brandontosch/terraform,VladRassokhin/terraform,iljaskevic/terraform,heimweh/terraform,iljaskevic/terraform,drebes/terraform,luis-silva/terraform,ewbankkit/terraform,drebes/terraform,tpounds/terraform,ewbankkit/terraform,ewbankkit/terraform,tommynsong/terraform,VladRassokhin/terraform,apparentlymart/terraform,pdecat/terraform,gechr/terraform,rnaveiras/terraform,nlamirault/terraform,tpounds/terraform,brandontosch/terraform,luis-silva/terraform,brandontosch/terraform,nlamirault/terraform,mattray/terraform,apparentlymart/terraform,heimweh/terraform,pryorda/terraform,ewbankkit/terraform,youhong316/terraform,heimweh/terraform,tpounds/terraform,luis-silva/terraform,tommynsong/terraform,pradeepbhadani/terraform,pradeepbhadani/terraform,rnaveiras/terraform,hashicorp/terraform,iljaskevic/terraform,pdecat/terraform,brandontosch/terraform,pryorda/terraform,luis-silva/terraform,heimweh/terraform,brandontosch/terraform