parser: simplify parsing object key even more and fix unscan
parser: simplify parsing object key even more and fix unscan

strivecast/hcl,strivecast/hcl,strivecast/hcl,KONTRAKT-DLL/hcl,strivecast/hcl,hashicorp/hcl,savaki/hcl,hashicorp/hcl,strivecast/hcl,hashicorp/hcl,hashicorp/hcl,fatih/hcl,hashicorp/hcl