line isSingle mistake

Author: sovdeeth

src/main/java/com/sovdee/skriptparticles/elements/expressions/constructors/ExprLine.java

@@ -155,8 +155,8 @@ protected Line[] get(Event event) {
     public boolean isSingle() {
         return switch (matchedPattern) {
             case 0 -> end.isSingle() && start.isSingle();
-            case 1 -> true;
-            default -> false;
+            case 1, 2 -> true;
+            default -> throw new IllegalStateException("invalid pattern " + matchedPattern);
         };
     }