AoE cone ammo does not apply ammo_effects properly.

[chaosvolt]

Describe the bug

Ammo effects that create fields don't work with the AoE ammo feature. This can be most readily seen with dragon's breath shells, which no longer leave behind fire from the STREAM ammo_effect following #2619

Hardcoded on-hit effects like INCENDIARY SEEM to still work but it's a giant pain in the ass to test because that flag has a pathetically low chance of lighting targets on fire compared to the IGNITE flag.

Steps To Reproduce

1. Spawn in a shotgun and load with dragon's breath shells.
2. Repeatedly fire at a debug monster with it.
3. Observe that it never leaves behind any fire on the ground.

Screenshots

No response

Versions and configuration

• OS: Windows
  • OS Version: 10.0 1809
• Game Version: 104d41e [64-bit]
• Graphics Version: Tiles
• Game Language: []
• Mods loaded: [
  Bright Nights [bn],
  Arcana and Magic Items [Arcana],
  Elevated bridges [elevated_bridges],
  No Fungal Monsters [No_Fungi],
  Disable NPC Needs [no_npc_food],
  Manual Bionic Installation [manualbionicinstall],
  Stats Through Kills [stats_through_kills]
  ]

Additional context

No response