GDScript: Fix @warning_ignore annotation issues

modules/gdscript/tests/scripts/parser/features/signal_declaration.gd

@@ -1,5 +1,3 @@
-#GDTEST_OK
-
 # No parentheses.
 signal a
 
@@ -16,5 +14,15 @@ signal d(
 	c,
 )
 
+# With type hints.
+signal e(a: int, b: Variant, c: Node)
+
+func no_exec():
+	a.emit()
+	b.emit()
+	c.emit()
+	d.emit()
+	e.emit()
+
 func test():
 	print("Ok")