fix: Prevent multiple next button clicks #6236

Job	Run time
generate-ffi	3m 35s
10101 node tests	4m 24s
lint-commits	4s
formatting-dprint	17s
e2e_tests_prepare	11m 15s
clippy	1m 2s
payout-curve	2m 9s
Format and lint Flutter code	3m 21s
unit-tests	5m 26s
e2e-tests (./target/debug/deps/e2e_basic-34827a822bf103d6)	4m 51s
e2e-tests (./target/debug/deps/e2e_close_position-68e9e2a3bf89487d)	6m 25s
e2e-tests (./target/debug/deps/e2e_collaborative_close_channel-15ea2f7de2fde3b0)	5m 50s
e2e-tests (./target/debug/deps/e2e_collaborative_revert-7c24ec6a8a83e1f8)	5m 52s
e2e-tests (./target/debug/deps/e2e_force_close_position-b7fb39dd32f6510b)	5m 43s
e2e-tests (./target/debug/deps/e2e_force_close_settled_channel-295a3884c78f31a7)	6m 7s
e2e-tests (./target/debug/deps/e2e_open_position-733d512917473e69)	5m 21s
e2e-tests (./target/debug/deps/e2e_open_position_small_utxos-cd76fb2d26f02ce5)	5m 56s
e2e-tests (./target/debug/deps/e2e_open_position_with_external_funding-49c9c7c6e5b981e3)	5m 1s
e2e-tests (./target/debug/deps/e2e_reject_offer-9053ff05a0246c0a)	5m 10s
e2e-tests (./target/debug/deps/e2e_resize_position-99ae4182f28368c3)	5m 59s
e2e-tests (./target/debug/deps/e2e_restore_from_backup-9c93e74a0315fbd2)	5m 40s
e2e-tests (./target/debug/deps/e2e_rollover_position-310bb1b5dd266398)	5m 43s
e2e_tests_check	1s
	1h 45m 12s

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