Folder Template does not work properly on Windows

## steps

I setup my template as follows to support both java and scala templates. This can be decided by using the scala respectively java parameter (true/false)

src/main/$if(java.truthy)$java$endif$/$package$/Class.scala
src/main/$if(scala.truthy)$scala$endif$/$package$/Class.java

## problem

If i run this template on Windows using sbt new file://{templatepath} (SBT 1.5.5)

if java = true and scala = false it will produce the following dirs:
src/main/java/{package}/Class.java
src/main/{package}/Class.scala
and if scala = true and java = false to:
src/main/scala/{package}/Class.scala
src/main/{package}/Class.java

Which is not as expected

## expectation

this should be evaluated if java = true and scala = false to:
src/main/java/{package}/Class.java
and if scala = true and java = false to:
src/main/scala/{package}/Class.scala

This works properly on an Unix System (SBT 1.5.5) but does not work correctly on an Windows machine (SBT 1.5.5) (using the same template)
## notes

Reproduce the template with `sbt new file://{templatepath}` on Windows using SBT 1.5.5, testing both java=true/scala=false and scala=true/java=false. Compare the generated paths with the Unix results and the expected paths in the issue; done means only the selected language directory is created and the file is placed there.

Written by the indexing model from the issue text.