Module :Delete & View bugs when there are redundant copys

[nus-pe-script]

Describe the bug
A clear and concise description of what the bug is.
When there is more than one modules with the same module code, the edit and delete command can not delete / view all the codes
To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
If applicable, add screenshots to help explain your problem.

Additional context
Add any other context about the problem here.

---

Reported by: @OscarZeng
Severity: Not Specified

_{[original: nusCS2113-AY1819S1/pe-1#493]}

[harriuscai]

The underlying cause of this bug is as originally reported in #267, and subsequently in a duplicate issue #268