FontControlModel::convertFastPropertyValue: fix bad cast of Kerning

Casting sal_Bool to integer lets the comparison always fail.

Change-Id: I33cf9e9b6a65f81166870bdfe32e9a97101501df
forms: avoid deadlock when setting FontControlModel properties

Deadlock found in forms_unoapi on Windows, with
OGridControlModel::setFastPropertyValue_NoBroadcast() calling event
handler that tries to lock SolarMutex.

FontControlModel::setFastPropertyValue_NoBroadcast() and its callers in
3 other classes must not send events via firePropertyChange()
because they are called by OPropertySetHelper::setFastPropertyValues()
with its Mutex locked.

It is possible (though sadly quite convoluted) to delay the sending of
the events by calling setDependentFastPropertyValue() instead.

Change-Id: I0c767cfec01fe1bcaeb1236287b5faf81a2e7441