[matcher] Simplify logic

Another test fails now. Needs to be investigated.

src/hb-ot-layout-gsubgpos.hh

diff --git a/src/hb-ot-layout-gsubgpos.hh b/src/hb-ot-layout-gsubgpos.hh
index 370c30f..48a3c83 100644
--- a/src/hb-ot-layout-gsubgpos.hh
+++ b/src/hb-ot-layout-gsubgpos.hh
@@ -522,10 +522,7 @@
     {
       idx = start_index_;
       end = c->buffer->len;
-      if (per_syllable)
-	matcher.set_syllable (start_index_ == c->buffer->idx ? c->buffer->cur().syllable () : 0);
-      else
-	matcher.set_syllable (0);
+      matcher.set_syllable (per_syllable ? c->buffer->cur().syllable () : 0);
     }
 
 #ifndef HB_OPTIMIZE_SIZE