Revert "Disable a search test on Phantom"

This reverts commit e7b737c8.

test/search_test.js

@@ -70,7 +70,6 @@
   })
 
   test("expandingCaseFold", function() {
-    if (phantom) return; // A Phantom bug makes this hang
     var doc = new CodeMirror.Doc("<b>İİ İİ</b>\n<b>uu uu</b>")
     run(doc, "</b>", true, 0, 8, 0, 12, 1, 8, 1, 12);
     run(doc, "İİ", true, 0, 3, 0, 5, 0, 6, 0, 8);