Fix side by side view column headers to use normal font

I messed up the CSS class priority at some point in my recent changes
and caused this to not pick up the norm-font like we wanted it to.

Change-Id: Iccf7fdaa824d875d28603828611aafcdc09ea12b
Signed-off-by: Shawn O. Pearce <sop@google.com>
1 file changed