[6.0] fix invalid json in mysql install (#45855)

Thank you for finding this bug, and the testers for ... testing it

Author: heelc29

installation/sql/mysql/base.sql

@@ -413,7 +413,7 @@ INSERT INTO `#__extensions` (`package_id`, `name`, `type`, `element`, `folder`,
 -- Templates
 INSERT INTO `#__extensions` (`package_id`, `name`, `type`, `element`, `folder`, `client_id`, `enabled`, `access`, `protected`, `locked`, `manifest_cache`, `params`, `custom_data`, `ordering`, `state`) VALUES
 (0, 'atum', 'template', 'atum', '', 1, 1, 1, 0, 1, '', '', '', 0, 0),
-(0, 'cassiopeia', 'template', 'cassiopeia', '', 0, 1, 1, 0, 1, '', '{"brand":"1","logoFile":"","siteTitle":"","siteDescription":"","useFontScheme":"0","colorName":"colors_standard","fluidContainer":"0","stickyHeader":0,"backTop":0",colorSettings":1,"headerbg":"rgb(193, 205, 207)","headercolor":"rgb(23, 23, 23)","bodybg":"rgb(254, 254, 254)","bodycolor":"rgb(23, 23, 23)","linkcolor":"rgb(29, 121, 137)","linkcolorh":"rgb(14, 59, 67)","btnbg":"rgb(206, 60, 55)","btnbgh":"rgb(131, 35, 32)","btncolor":"rgb(254, 254, 254)","btncolorh":"rgb(254, 254, 254)","footerbg":"rgb(29, 121, 137)","footercolor":"rgb(254, 254, 254)","fontSettings":1,"bodysize":"1","h1size":"2","h2size":"1.7","h3size":"1.5"}', '', 0, 0);
+(0, 'cassiopeia', 'template', 'cassiopeia', '', 0, 1, 1, 0, 1, '', '{"brand":"1","logoFile":"","siteTitle":"","siteDescription":"","useFontScheme":"0","colorName":"colors_standard","fluidContainer":"0","stickyHeader":0,"backTop":0,"colorSettings":1,"headerbg":"rgb(193, 205, 207)","headercolor":"rgb(23, 23, 23)","bodybg":"rgb(254, 254, 254)","bodycolor":"rgb(23, 23, 23)","linkcolor":"rgb(29, 121, 137)","linkcolorh":"rgb(14, 59, 67)","btnbg":"rgb(206, 60, 55)","btnbgh":"rgb(131, 35, 32)","btncolor":"rgb(254, 254, 254)","btncolorh":"rgb(254, 254, 254)","footerbg":"rgb(29, 121, 137)","footercolor":"rgb(254, 254, 254)","fontSettings":1,"bodysize":"1","h1size":"2","h2size":"1.7","h3size":"1.5"}', '', 0, 0);
 
 -- Files Extensions
 INSERT INTO `#__extensions` (`package_id`, `name`, `type`, `element`, `folder`, `client_id`, `enabled`, `access`, `protected`, `locked`, `manifest_cache`, `params`, `custom_data`, `ordering`, `state`) VALUES