Tombstone fixes

[MishimaHaruna]

Pull Request Prelude

• I have followed proper Hercules code styling.
• I have read and understood the contribution guidelines before making this PR.
• I am aware that this PR may be closed if the above-mentioned criteria are not fulfilled.

Changes Proposed

This PR includes two fixes related to the MVP tombstones:

• When a player is talking to the tombstone while it disappears, it no longer gets stuck and requires to relog.
• When a player clicks (multiple times) a tombstone to read its message, it no longer prints the message several times inside the same NPC dialog.

Issues addressed:

[HerculesWSAPI]

This change is