Knight Heroic Shield Refresh

[Nevrus]

This is a problem that only affects me right now but it will continue to be a problem for the rest of this server's life.

Expanding PDK's Heroic Shield to 3 rounds is a big boost to how much spamming I have to do, but I still have to spam the heck out of it around the 18s mark to keep it active. Multiple people have told me 'enjoy the RSI' because of how it works.

One simple tweak will save this.

Current functionality:
1. Round 1 after using, use again - Error: "You can only use that ability once per round."
2. Round 2 or 3, use on same target: "That character is already affected."
3. Round 2 or 3, use on different target: ability on target 1 ends, shield applies to different target.

All that would be necessary to fix this functionality is combining points 2 and 3 - using it after the 1 Round cooldown immediately ends it on the first target, and applies it to the new target - even if it's the first target. This gives a 12s window to reapply, instead of needing to start spamming it at 16s to pick it up immediately when it expires.

Save my fingies. Thank you!