make uft8mb4 default charset for databases (#3534)

web/templates/pages/add_db.php

@@ -140,8 +140,8 @@
 							<option value=gbk <?php if ((!empty($v_charset)) && ( $v_charset == 'gbk')) echo 'selected';?>>gbk</option>
 							<option value=latin5 <?php if ((!empty($v_charset)) && ( $v_charset == 'latin5')) echo 'selected';?>>latin5</option>
 							<option value=armscii8 <?php if ((!empty($v_charset)) && ( $v_charset == 'armscii8')) echo 'selected';?>>armscii8</option>
-							<option value=utf8 <?php if ((!empty($v_charset)) && ( $v_charset == 'utf8')) echo 'selected';?> <?php if (empty($v_charset)) echo 'selected';?>>utf8</option>
-							<option value=utf8mb4 <?php if ((!empty($v_charset)) && ( $v_charset == 'utf8mb4')) echo 'selected';?>>utf8mb4</option>
+							<option value=utf8 <?php if ((!empty($v_charset)) && ( $v_charset == 'utf8')) echo 'selected';?>>utf8</option>
+							<option value=utf8mb4 <?php if ((!empty($v_charset)) && ( $v_charset == 'utf8mb4')) echo 'selected';?> <?php if (empty($v_charset)) echo 'selected';?>>utf8mb4</option>
 							<option value=ucs2 <?php if ((!empty($v_charset)) && ( $v_charset == 'ucs2')) echo 'selected';?>>ucs2</option>
 							<option value=cp866 <?php if ((!empty($v_charset)) && ( $v_charset == 'cp866')) echo 'selected';?>>cp866</option>
 							<option value=keybcs2 <?php if ((!empty($v_charset)) && ( $v_charset == 'keybcs2')) echo 'selected';?>>keybcs2</option>