Fix merge of visual test

https://github.com/mathquill/mathquill/commit/3de91d8f5a2f96f3a805dfd341010fcb4bba3ca9#commitcomment-17218984
diff --git a/test/visual.html b/test/visual.html
index 027785e..591c0f8 100644
--- a/test/visual.html
+++ b/test/visual.html
@@ -77,7 +77,7 @@
   <td><span class="mathquill-static-math">\sqrt{\MathQuillMathField{x^2+y^2}}</span>

 </table>

 

-<p>Touch taps/clicks/mousedown to drag should work anywhere in the blue box: <div class="math-container" style="border: solid 1px lightblue; height: 5em; width: 15em; line-height: 5em; text-align: center; -webkit-tap-highlight-color: rgba(0,0,0,0)"><span class="mathquill-math-field">a_2 x^2 + a_1 x + a_0 = 0</span></div>

+<p>Touch taps/clicks/mousedown to drag should work anywhere in the blue box: <div class="math-container" style="border: solid 1px lightblue; height: 5em; width: 15em; line-height: 5em; text-align: center; -webkit-tap-highlight-color: rgba(0,0,0,0)"><span class="mathquill-math-field">x_{very\ long\ thing}^2 + a_0 = 0</span></div>

 

 <h3>Redrawing</h3>

 <p>