fix: package seletor REGEX

[fly2F]

From REGEX="Package ID: (.*), Label: $LABEL" To REGEX="Package ID: ([^,]*), Label: $LABEL"

REGEX default is "Greedy search"

[lindluni]

Once change #138 is merged you'll need to do a rebase on the master branch to fix this issue.
You'll also need to sign off your commit following these instructions: https://github.com/hyperledger/fabric-samples/pull/135/checks?check_run_id=483880620

[lindluni]

#138 was merged, please rebase on the tip of master

[lehors]

LGTM. Thanks for your contribution!