[mcedevicelock] Use correct slot type in inactivity connect. Fixes JB…

…#37002

While every other mce D-Bus signals that device lock plugins listens to
carries string value, the inactivity state has boolean value. Probably
this was missed during refactoring and incorrect slot type is used, which
leads to device lock plugin ignoring user activity altogether and device
gets locked too early / despite being actively used.

Use connect type that matches the handleInactivityStateChanged() slot.

Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

src/lib/mcedevicelock.cpp

@@ -244,7 +244,7 @@ void MceDeviceLock::trackInactivityState(void)
     trackMceProperty(
                 this,
                 QStringLiteral(MCE_INACTIVITY_SIG),
-                SLOT(handleInactivityStateChanged(QString)),
+                SLOT(handleInactivityStateChanged(bool)),
                 QStringLiteral(MCE_INACTIVITY_STATUS_GET),
                 &MceDeviceLock::handleInactivityStateReply);
 }