Bug#4362: lyx should have `section: contrib'

[Ian Jackson <ian@chiark.chu.cam.ac.uk>]

Package: lyx
Version: 0.10.1-1

 Package: lyx
 Priority: optional
 Section: tex

This should read
 Section: contrib
as per section 3.1.3 of the policy manual (version 2.0.1.0), `Section
and Priority'

Ian.