Fix bad test in WASM version of HNTrieContainer

The erroneous test does not seem to interfere
with the proper functioning of the trie, due
to the fact that nodes are never split without
a OR node or boundary node being present.

The issue was found when undertaking a rewrite
of the algorithm to avoid having to create
boundary nodes.

src/js/wasm/hntrie.wat

@@ -197,7 +197,7 @@
         br_if $noSegment
         ;; if ( this.buf32[icell+2] === 0 ) {
         get_local $icell
-        i32.load
+        i32.load offset=8
         i32.eqz
         if
             ;; if ( ineedle === 0 || this.buf[ineedle-1] === 0x2E ) {