fix: don't change app bar colour when scrolling #6282

Job	Run time
10101 node tests	6m 59s
generate-ffi	3m 21s
formatting-dprint	15s
lint-commits	6s
Format and lint Flutter code	47s
payout-curve	5m 14s
clippy	4m 7s
e2e_tests_prepare	11m 46s
unit-tests	8m 37s
e2e-tests (./target/debug/deps/e2e_basic-0d62a77a1d830e44)	4m 55s
e2e-tests (./target/debug/deps/e2e_close_position-335ba79a7dfeef41)	5m 55s
e2e-tests (./target/debug/deps/e2e_collaborative_close_channel-79f9bcadde55acd5)	5m 46s
e2e-tests (./target/debug/deps/e2e_collaborative_revert-1c4b00c4e303e19f)	5m 44s
e2e-tests (./target/debug/deps/e2e_force_close_position-f1b15920067ccdfd)	5m 33s
e2e-tests (./target/debug/deps/e2e_force_close_settled_channel-e638315814eba5ba)	5m 45s
e2e-tests (./target/debug/deps/e2e_open_position-88e360e83ae12fb9)	5m 9s
e2e-tests (./target/debug/deps/e2e_open_position_small_utxos-5610c99aa846e78b)	6m 10s
e2e-tests (./target/debug/deps/e2e_open_position_with_external_funding-f233b90bec6a5472)	5m 10s
e2e-tests (./target/debug/deps/e2e_reject_offer-dd92252e4a09c718)	5m 0s
e2e-tests (./target/debug/deps/e2e_resize_position-e1ca7e8c7dde0625)	6m 22s
e2e-tests (./target/debug/deps/e2e_restore_from_backup-78aadfa5751d727f)	5m 48s
e2e-tests (./target/debug/deps/e2e_rollover_position-f2cb36437758d88f)	5m 42s
e2e_tests_check	1s
	1h 54m 12s

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