Make Shield Overcharge apply to allies

[MatthewMarinets]

MindHawk pointed this out here: https://discord.com/channels/731205301247803413/980554570075873300/1273375419927625738

Also, Shield Overcharge doesn't apply to allies it normally does
(this is usually applied on map init)

Sounds like it should be a pretty quick fix per-map, but may have to be applied independently on a lot of maps.

[Bicoloursnake]

Shield Overcharge, not Guardian Shell