Don't generate specialized overrides in traits

The term "specialized override" is used to describe a method
in a synthetic specialized subclass that generically substitutes
the specialized type args into the siganture of a generic method.

For example, `trait T[@spec A] { def t(a: A) }` gives rise to
`def t(a: Int)` under the type environment `A=Int`.

This commit avoids doing this for specialized traits, only classes
have these overrides now. The motivation is to make it simpler to
use specialized interfaces (like `T$mcI$sp` from the example above)
as Java functional interfaces.

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