SQL single quote string literals (#6701)

https://www.sqlite.org/quirks.html#double_quoted_string_literals_are_accepted
fix https://github.com/FreshRSS/FreshRSS/issues/6602
And MySQL at the same time https://dev.mysql.com/doc/refman/9.0/en/string-literals.html

app/SQL/install.sql.mysql.php

@@ -65,7 +65,7 @@ CREATE TABLE IF NOT EXISTS `_entry` (
 ) DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci
 ENGINE = INNODB;
 
-INSERT IGNORE INTO `_category` (id, name) VALUES(1, "Uncategorized");
+INSERT IGNORE INTO `_category` (id, name) VALUES(1, 'Uncategorized');
 
 CREATE TABLE IF NOT EXISTS `_entrytmp` (	-- v1.7
 	`id` BIGINT NOT NULL,

app/SQL/install.sql.sqlite.php

@@ -60,7 +60,7 @@ CREATE INDEX IF NOT EXISTS entry_is_read_index ON `entry`(`is_read`);
 CREATE INDEX IF NOT EXISTS entry_lastSeen_index ON `entry`(`lastSeen`);	-- //v1.1.1
 CREATE INDEX IF NOT EXISTS entry_feed_read_index ON `entry`(`id_feed`,`is_read`);	-- v1.7
 
-INSERT OR IGNORE INTO `category` (id, name) VALUES(1, "Uncategorized");
+INSERT OR IGNORE INTO `category` (id, name) VALUES(1, 'Uncategorized');
 
 CREATE TABLE IF NOT EXISTS `entrytmp` (	-- v1.7
 	`id` BIGINT NOT NULL,