[lua] Self Destruct chance

[ThrisStraizo]

I affirm:

• I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• I have read and understood the Contributing Guide and the Code of Conduct.
• I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

This PR adjusts the chance for regular bombs to explode to around 25%.

I ultimately testing only letting bombs tp above 25%, under 25%, and all the time, and they all looked about the same.
Ultimately the chance was between 25-30%, ending with 171 berserks and 65 self destructs.

I have set the chance to return at 66%, and because of how math works, that ultimately means they will choose self destruct around 25% of the time.

I removed the HP requirement from grow bombs as I know that's bullshit from testing, and removed the NM blocker as that is already handled in the grow bomb mixin.

https://www.dropbox.com/scl/fo/z650rc7kepgjz4ui89obp/APBJpLrSukfyqy-1j14GgnQ?rlkey=2hr7tfc928aei6wvu5c1bvobx&st=tx1grsco&dl=0

Steps to test these changes

!tp 3000 some bombs.

[Xaver-DaRed]

not a fan. Why not have a family mixing for their skill weights, so we dont have a 34% that is actually somehow a 25%

[ThrisStraizo]

Updated this to reflect the return rate needed to match Frank's PR fix to how mobs use TP skills.