Add missing test cases in script_tests.cpp

Summary: Some tests case were present in script_tests.json but missing from script_tests.cpp . This is fixing that error.

Test Plan:

make check

Reviewers: #bitcoin_abc, schancel

Reviewed By: #bitcoin_abc, schancel

Subscribers: teamcity

Differential Revision: https://reviews.bitcoinabc.org/D1197