#205512 fix for 7.1

According to new JIRA issue
http://javafx-jira.kenai.com/browse/RT-18180
the current (2.0.2) JavaFX RT still fails to
run unsigned FXML applications in WebStart or browser plugin.
NetBeans applied the workaround of enabling signing by default
for FXML applications as filed here:
http://netbeans.org/bugzilla/show_bug.cgi?id=202615
But this has not propagated specifically to
the FXML-login sample (the same as addressed in the JIRA issue).
This sample will thus fail to run in WebStart or browser plugin
unless we switch signing on for it by default.

The fix is trivial and well localized to
only the .properties file of the affected sample:

http://hg.netbeans.org/jet-main/rev/1b6f5edf17a4

As such it can not affect any code outside
FXML-login demo.

Petr Somol