Use architecture-independent location of abrt-java-connector

The connector's library has been moved to architecture-independent
directory /usr/lib/abrt-java-connector/, because Java does not
officially support multilib and having the connector installed the arch
specific directory was causing us problems if Java package doesn't match
host architecture (e.g. Java i386 on host x86_64).

Signed-off-by: Jakub Filak <jfilak@redhat.com>