Correctly resolve overloaded Java methods in hyperlinking

The Scala selection engine didn't build the correct signature
for Java methods taking array parameters. It turns out that
the special-handling `mapParamType` wasn't needed, and the
existing `mapType` method in `ScalaJavaMapper` was already
working correctly.

Fixed #1000421
Merge pull request #429 from dragos/issue/hyperlink-overloaded-java-1000421

Correctly resolve overloaded Java methods in hyperlinking