Powered Phoenix Rod is missing audio and does not use ammo when WeaponPower2 is granted while attacking

[Virathas]

If the player is attacking with Phoenix Rod, and during the attack the player uses a Tome of Power, the subsequent "flamethrower" has no audio. Furthermore, the attack does not have a timeout, so it can be used for free for the entirety of the powerup duration.

Reproduction Steps:
1. Launch the latest GZDoom (4.10.0) with HERETIC
2. Start a game on any map
3. Use the Give all cheat to get both Phoenix Rod and Tome of Power
4. Select Phoenix Rod, and start attacking
5. During the attack use the Tome of Power
6. Notice that no audio for attack is present
7. Keep attacking until the powerup ends
8. Notice that the flamethrower did not expire nor depleted the ammo during the powerup

Repro Rate: 10/10