Various quest music fixes (including for Digsite and Ikov)

What has been done in this MR?

• Correct music locations for Tolna's rift. Apparently, a git mishap on my part caused some of my corrections for !1660 (merged) to not actually be included in that MR, so here they are again.
• The Digsite and Exam Centre now correctly play Lullaby and Venture all the time, and no longer play Method of Madness in certain parts.
• Correct borders for Venture 2, which now correctly plays in the dungeons underneath the Digsite.
• Correct borders for Chain of Command, which now correctly plays in all of the Temple of Ikov dungeon (and the two versions of the boots of lightness dungeon).
• Add a new track: the brine rat cave now plays Rising Damp.

What should testers check?

• Correct borders inside Tolna's rift (the wall textures help you out in finding the exact coordinates)
• Digsite, Exam Centre, and Digsite dungeon play correct music
• Temple of Ikov dungeon plays correct music
• Brine rat cave plays Rising Damp throughout the whole dungeon
• When testing the above, be sure to relog frequently. This is because if a coordinate does not have any music associated with it, the game will simply keep playing what was playing last. So you need to relog (which clears this last played track and resets it to the default song of Harmony) to be sure I didn't leave any dead zones.

• I have tested these changes thoroughly.

• I used the relevant Thanos/Zaros tool for any JSON edits where possible, and have attached screenshots of any changes.