Launcher: do not write .desktop files in debug mode
Launcher: do not write .desktop files in debug mode

... because the .desktop file would refer to the absolute path of
the debug executable, then.

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

biovoxxel/imagej,biovoxxel/imagej,TehSAUCE/imagej,TehSAUCE/imagej,biovoxxel/imagej,TehSAUCE/imagej