Fix Python decorators highlighting

As per PR https://github.com/cmur2/joe-syntax/pull/16 from @avli it does:

This fixes highlighting of the decorators with arguments. For example, the following code highlighting was broken:

```python

@first
@second("arg1", "arg2")
def my_fun():
    pass

```

python.jsf

@@ -35,7 +35,7 @@
 # annotations
 :decorator Decorator
 	*		decorator
-	" \t\r\n"	idle		noeat
+	" (\t\r\n"	idle		noeat
 
 :comment Comment
 	*		comment