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vp8: fix loop filter level clamping

the loop filter level is transmitted as 6-bits + sign so needs to be clamped in
the delta + absolute case.

BUG=https://bugzilla.mozilla.org/show_bug.cgi?id=1224363

Change-Id: Icbdca4fdbf043466429bd5c9d59dbe913bf153bc

--- a/vp8/common/vp8_loopfilter.c

+++ b/vp8/common/vp8_loopfilter.c

@@ -141,8 +141,8 @@

             else  /* Delta Value */

             {

                 lvl_seg += mbd->segment_feature_data[MB_LVL_ALT_LF][seg];

-                lvl_seg = (lvl_seg > 0) ? ((lvl_seg > 63) ? 63: lvl_seg) : 0;

             }

+            lvl_seg = (lvl_seg > 0) ? ((lvl_seg > 63) ? 63: lvl_seg) : 0;

         }

         if (!mbd->mode_ref_lf_delta_enabled)