Update problemHistory.js

fix the problem page layout confusion when it displays the '[show]' tag in a small window.

cat-home/src/main/webapp/js/problemHistory.js

 function historyGraphLineChart(cell, response) {
-	cell.style.display = 'block';
-	cell.parentNode.style.display = 'block';
+	cell.style.display = 'table-cell';
+	cell.parentNode.style.display = 'table-cell';
 	cell.innerHTML = response;
 
 	var data = $('#errorTrendMeta', cell).text();