OXDEV-7667: Dispatch ThemeSettingChangedEvent only if value changed #99

Job	Run time
Php-8.0-Mysql-5.7 / install_shop_with_module	2m 10s
Php-8.0-Mysql-5.7 / codeception_twig	10m 2s
Php-8.0-Mysql-5.7 / unit_integration_tests	1m 42s
Php-8.0-Mysql-5.7 / styles	1m 45s
Php-8.0-Mysql-5.7 / sonarcloud	51s
	16m 30s

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