lisu, Fix low line glide symbol

Author: r12a

lisu/index.html

@@ -116,7 +116,7 @@
 <div>
 <span class="g"><span class="hint">ɑ</span><span class="c">ꓮ</span></span>
 <span class="g"><span class="hint">ɛ</span><span class="c">ꓯ</span></span>
-<span class="g"><span class="hint">ä</span><span class="c">_</span></span>
+<span class="g"><span class="hint">ä</span><span class="c">ˍ</span></span>
 </div>
 <div>
 <span class="g"><span class="hint">ə</span><span class="c">ꓷ</span></span>