logind: fix abnormal switching causing the screen to go black

logind: fix abnormal switching causing the screen to go black

After logind receives the SIGRTMIN signal from the kernel, it will execute
manager_vt_switch---session_leave_vt---session_device_pause_all,The device
permissions of the session are removed here;under normal circumstances, the
tty value read from /sys/class/tty/tty0/active changes and switchesto a new
session,give the new session resume device permissions.
But under abnormal circumstances (such as switching quickly on a device using
wayland; and sometimes the kernel will suddenly send a SIGRTMIN signal, but
nothing changes),In these cases, logind does not give session resume device
permission, causing the device to have a black screen and suspended animation.