correct relevance test for programgenres

The relevance column is used for sequencing but
it is not a number, but a character.  Testing
for > 0 results in not returning the entire list
of genres when the set is large (which can be
generated by (at least) the schedules direct
grabbers for some programs).

Fixes: #212
Fixes: #213

Signed-off-by: Peter Bennett <pbennett@mythtv.org>

mythtv/programs/mythfrontend/progdetails.cpp

@@ -621,7 +621,7 @@ void ProgDetails::loadPage(void)
 
     query.prepare("SELECT genre FROM programgenres "
                   "WHERE chanid = :CHANID AND starttime = :STARTTIME "
-                  "AND relevance > 0 ORDER BY relevance;");
+                  "AND relevance <> '0' ORDER BY relevance;");
     query.bindValue(":CHANID",    m_progInfo.GetChanID());
     query.bindValue(":STARTTIME", m_progInfo.GetScheduledStartTime());