Fix 'outside' detect not firing when 'cross' is present

This commit fixes an issue when having two geofences that are
tracking the same collection using the same geometry, except one
fence has detect='cross,outside' and the other is just 'outside'.
Only the 'cross,outide' fence sends notifications when an object
crosses, while the other does not send any events, evn though the
object is actually outide.

Author: tidwall

internal/server/fence.go

@@ -179,7 +179,7 @@ func fenceMatch(
 				detect = "inside"
 				continue
 			}
-			if detect == "exit" {
+			if detect == "exit" || detect == "cross" {
 				detect = "outside"
 				continue
 			}