Fix designer

[udan11]

Use this query to create a database and then click on Designer link.

CREATE DATABASE IF NOT EXISTS `"'"><iframe onload=alert(1)>` 
DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;
USE `"'"><iframe onload=alert(1)>`;
CREATE TABLE `"'"><iframe onload=alert(1)>` (
  `"'"><iframe onload=alert(1)>` int(11) NOT NULL,
  `data` text NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
ALTER TABLE `"'"><iframe onload=alert(1)>`
  ADD PRIMARY KEY (`"'"><iframe onload=alert(1)>`);
ALTER TABLE `"'"><iframe onload=alert(1)>`
  MODIFY `"'"><iframe onload=alert(1)>` int(11) NOT NULL AUTO_INCREMENT;

[codecov]

Codecov Report

Merging #13191 into QA_4_7 will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           QA_4_7   #13191   +/-   ##
=======================================
  Coverage   54.39%   54.39%           
=======================================
  Files         466      466           
  Lines       69311    69311           
=======================================
  Hits        37703    37703           
  Misses      31608    31608

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[nijel]

Merged, thanks for your contribution!