Launcher: make java.home match the current JRE
Launcher: make java.home match the current JRE

When a JRE was found, we should not set the java.home property
to something completely different. We use the suffix '/jre' as a
tell-tale that the JRE is actually part of a JDK, and only in that
case do we point java.home to said JDK.

Signed-off-by: Johannes Schindelin <53fb8db7833fca1e1746dd8592f61048d350f64c@gmx.de>

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