cpuload: Fix wrong idle thread load #1263

Job	Run time
variables	1s
fc_matrix (pixhawk) / build	5m 42s
fc_matrix (fmu-v6xrt) / build	6m 47s
fc_matrix (saluki-pi_amp) / build	9m 5s
fc_matrix (saluki-pi_custom_keys, Tools/saluki-sec-scripts/custom_keys/saluki-pi/px4_bin_ed25519_... / build	9m 22s
fc_matrix (saluki-pi_flat) / build	6m 17s
fc_matrix (saluki-pi_default) / build	9m 4s
fc_matrix (saluki-v2_amp) / build	8m 30s
fc_matrix (saluki-v2_custom_keys, Tools/saluki-sec-scripts/custom_keys/saluki-v2/px4_bin_ed25519_... / build	8m 46s
fc_matrix (saluki-v2_default) / build	8m 43s
fc_matrix (saluki-v2_flat) / build	6m 34s
fc_matrix (saluki-v3_amp) / build	8m 39s
fc_matrix (saluki-v3_custom_keys, Tools/saluki-sec-scripts/custom_keys/saluki-v3/px4_bin_ed25519_... / build	9m 4s
fc_matrix (saluki-v3_default) / build	8m 50s
fc_matrix (saluki-v3_flat) / build	6m 2s
build px4fwupdater	2m 3s
upload builds to UAE artifactory	3m 7s
upload px4fwupdater to docker registry	1m 24s
upload px4fwupdater to UAE docker registry	0s
	1h 58m 0s

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