WebUI: Make column width less variable in transferlist

Each column has a fixed width that allows to read its content.
The column for the name of the torrents has a variable width with an
upper and a lower constraint.

If the width of the page is not sufficient to fit the table, a scrollbar
will appear.

src/webui/www/public/css/dynamicTable.css

@@ -64,3 +64,11 @@
 #transferList img.statusIcon {
   margin-bottom: -4px;
 }
+
+#transferList th,
+#transferList td {
+	text-overflow: ellipsis;
+	overflow: hidden;
+	white-space: nowrap;
+	max-width: 300px;
+}