sensors: Use an unique global timeout

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
upower: Correctly init the section context

Fix a segfault.

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
j4status: Fix an incorrect condition

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>