[backport] `deserializeLambda` should not use encoded class name

`javaBinaryName` returns the internal name of a class.
Also used in BTypesFromsymbols.classBTypeFromSymbol.

Weirdly, this was discovered due to a bizarre osgi bnd error:

```
[bnd] # addAll '/Users/luc/scala/scala/build/pack/lib/scala-library.jar' with :,
[bnd] # addAll '/Users/luc/scala/scala/build/osgi/scala-library.bnd' with ,
[bnd] 1 ERRORS
[bnd]  The default package '.' is not permitted by the Import-Package syntax.
[bnd]  This can be caused by compile errors in Eclipse because Eclipse creates
[bnd] valid class files regardless of compile errors.
[bnd] The following package(s) import from the default package [scala.collection.generic, scala.sys.process, scala.collection.parallel.mutable, scala.util, scala.collection.parallel.immutable, scala.reflect, scala.concurrent.impl, scala.util.hashing, scala.collection.parallel, scala.collection.convert, scala.io, scala, scala.collection.concurrent, scala.util.control, scala.beans, scala.concurrent.duration, scala.collection, scala.runtime, scala.math, scala.collection.mutable, scala.concurrent, scala.sys, scala.collection.immutable, scala.ref, scala.util.matching]
[bnd] /Users/luc/scala/scala/build/osgi/scala-library.bnd: bnd failed
```

Lukas diagnosed it as a problem of the generated `$deserializeLambda$` function:

One example is `scala/App$class`. Its bytecode contains this:
```
  private static synthetic $deserializeLambda$(Ljava/lang/invoke/SerializedLambda;)Ljava/lang/Object;
    GETSTATIC scala$divApp$class.$deserializeLambdaCache$ : Ljava/util/Map;
    [...]
```
so it's a static field read of a top-level class.

`$div` should obviously be `/` (which this commit rectifies)

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