#735 final in dj1 generates double final modifier

[Mathias Ricken]

When the "final" modifier is used in the Intermediate level (dj1) when it is not allowed, the language level converter generates a double final modifier.

interface UnaryFun {
public Object apply(final Object arg);
}

generates

interface UnaryFun {
public Object apply(final final Object arg);
}

[Mathias Ricken]

Sample file