[rfc][icedtea-web] Very small SecurityDialog refactor

[Andrew Azores]

Changelog:
* /netx/net/sourceforge/jnlp/security/SecurityDialogs.java: refactored 
return statements following getUserResponse(message) calls

Not much to explain here really. Some of the if-else going on was a bit 
unnecessary since the return value is boolean as well, and checking if 
the reference is null before using the instanceof operator is also not 
needed as "null instanceof Foo" is defined as false anyway.

Thanks,

-- 
Andrew A

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