Fix target spotting for spotter

Modules/Spotter.lua

@@ -101,9 +101,12 @@ function shared.Spotter.Init()
 
 	local frame = CreateFrame("Frame")
 	frame:RegisterEvent("NAME_PLATE_UNIT_ADDED")
-	frame:RegisterEvent("TARGET_UNIT_CHANGED")
+	frame:RegisterEvent("UNIT_TARGET")
 	frame:SetScript("OnEvent", function(self, event, unit)
 		if not Heimdall_Data.config.spotter.enabled then return end
+		if event == "UNIT_TARGET" then
+			unit = "target"
+		end
 		local err = NotifySpotted(unit)
 		if err then
 			print(string.format("Error notifying %s: %s", tostring(unit), tostring(err)))