Fix incorrect comparator usage in FinalizingFieldAccessPostAggregator #10248

Job	Run time
build (jdk8)	13m 57s
build (jdk11)	12m 20s
build (jdk17)	13m 9s
build (jdk21)	12m 17s
unit tests (jdk8, sql-compat=false) / changes	2s
unit tests (jdk8, sql-compat=true) / changes	2s
unit tests (jdk8, sql-compat=false) / other_modules_test / other modules test	31m 51s
unit tests (jdk8, sql-compat=true) / other_modules_test / other modules test	32m 44s
unit tests (jdk8, sql-compat=true) / indexing_modules_test / indexing modules test	45m 26s
unit tests (jdk8, sql-compat=true) / processing_modules_test / processing modules test	54m 32s
unit tests (jdk8, sql-compat=true) / server_modules_test / server modules test	8m 0s
unit tests (jdk8, sql-compat=false) / processing_modules_test / processing modules test	57m 34s
unit tests (jdk8, sql-compat=false) / server_modules_test / server modules test	8m 5s
unit tests (jdk8, sql-compat=false) / indexing_modules_test / indexing modules test	47m 23s
standard-its	0s
revised-its	0s
unit tests (jdk${{ matrix.jdk }}, sql-compat=true)	0s
	5h 37m 22s

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