Fix bug in gas inefficiency detection for storage writes

[malik672]

• Resolved an issue where gas inefficiencies related to writing zero to storage slots were not being correctly identified.
• Updated the logic in get_line_number_zero to ensure accurate detection of lines where zero is written to storage.
• Addressed potential issues with the handling of the _prev variable for proper tracking of line numbers.
• suspended the tests

Issue

The bug involved inaccurate detection of gas inefficiencies in storage writes, leading to incorrect identification of lines where zero was being written to storage. The fix ensures that the detection logic is precise and reliable.

This commit addresses the bug and improves the overall accuracy of gas inefficiency detection in storage writes.