fix: water dispensers and purifers don't erase inherited flags anymore

[chaosvolt]

Purpose of change (The Why)

Fixes #6077

Describe the solution (The How)

Turns out water dispensers, and water purifiers for that matter, just copy from water heaters which already have the flag that #6005 accidentraly overrided their flags to give. So literally just a simple matter of deleting the redundant flag override since they already inherit ADV_DECONSTRUCT from water heaters, doi.

Describe alternatives you've considered

screm

Testing

1. Load-tested in compiled test build.
2. Spawned in a mine, checked the water dispenser to confirm it doesn't hold dirty water.
3. Can also actually pour the water into a container or try to drink it.

Additional context

Checklist

Mandatory

• I wrote the PR title in conventional commit format.
• I ran the code formatter.
• I linked any relevant issues using github keyword syntax like closes #1234 in Summary of the PR so it can be closed automatically.
• I've committed my changes to new branch that isn't main so it won't cause conflict when updating main branch later.
• I understand that, unless specified otherwise, my contributions will fall under the AGPL v3.0 and/or CC-BY-SA 4.0 licenses

[RobbieNeko]

Silly plumbing features, overwriting flags so blatantly