Correct ordering of PatchLineComments in ChangeNotes

In PatchLineCommentAccess, a preferred ordering is specified for
PatchLineComments (on lineNbr, then writtenOn). I previously wrote a
Comparator in ChangeNotes that originally specified a different
ordering. This change fixes the aforementioned Comparator to use the
ordering specified in PatchLineCommentAccess.

Change-Id: I8f478e0885a949d3e9dfa7bb0c0835158c39e0c4
1 file changed