Add missing quotes around selected option on line 75 (#2659)

web/templates/pages/edit_dns_rec.html

@@ -72,7 +72,7 @@
 						<tr>
 							<td>
 								<select class="vst-list" name="v_type">
-									<option value="A" <?php if ($v_type == 'A') echo selected; ?>>A</option>
+									<option value="A" <?php if ($v_type == 'A') echo "selected"; ?>>A</option>
 									<option value="AAAA" <?php if ($v_type == 'AAAA') echo "selected"; ?>>AAAA</option>
 									<option value="CAA" <?php if ($v_type == 'CAA') echo "selected"; ?>>CAA</option>
 									<option value="CNAME" <?php if ($v_type == 'CNAME') echo "selected"; ?>>CNAME</option>