Fix xpath-to-css converter

Author: mdmintz

seleniumbase/fixtures/xpath_to_css.py

@@ -103,7 +103,7 @@ def _get_raw_css_from_xpath(xpath):
             elif match['mattr']:
                 if match["mvalue"].find(" ") != -1:
                     match["mvalue"] = "\"%s\"" % match["mvalue"]
-                attr = "[%s=%s]" % (match['mattr'].replace("@", ""),
+                attr = '[%s="%s"]' % (match['mattr'].replace("@", ""),
                                     match['mvalue'])
         elif match['contained']:
             if match['cattr'].startswith("@"):