Simplify sanitize_mysql_command() call that extends the real mysql command

Just directly call readlink() which returns the full path regardless if it's
a symlink or a regular binary.

Signed-off-by: Donatas Abraitis <[email protected]>

Author: ton31337

src/DB_Command.php

@@ -2168,7 +2168,7 @@ protected function get_current_sql_modes( $assoc_args ) {
 	 */
 	private static function sanitize_mysql_command( $command, $default_flags ) {
 		return sprintf(
-			'/usr/bin/env $(test -L $(command -v %s) && /usr/bin/readlink -f $(command -v %s) || command -v %s)%s',
+			'/usr/bin/env $(/usr/bin/readlink -f $(command -v %s)%s',
 			$command,
 			$command,
 			$command,