timeLimitsManager: Reset screen time if daily limit is changed

If the limit for the day had already been reached, the
`timeLimitsManager` was not resetting the screen time state if the daily
limit setting was then changed (and increased).

Fix that, and add a unit test for it.

Signed-off-by: Philip Withnall <pwithnall@gnome.org>

Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/8164
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3603>

js/misc/timeLimitsManager.js

@@ -666,6 +666,8 @@ export const TimeLimitsManager = GObject.registerClass({
             // Schedule an update for when the limit will be reset again.
             this._scheduleUpdateState(startOfTomorrowSecs - nowSecs);
         } else if (this._userState === UserState.ACTIVE) {
+            newState = TimeLimitsState.ACTIVE;
+
             // Schedule an update for when we expect the limit will be reached.
             this._scheduleUpdateState(dailyLimitSecs - activeTimeTodaySecs);
         } else {