Fix #332925: Half duration shortcut crashes musescore when time signa…

…ture is 5/4

Crash happens only in Debug builds.

src/engraving/libmscore/cmd.cpp

@@ -2804,7 +2804,7 @@ void Score::cmdIncDecDuration(int nSteps, bool stepDotted)
     // if measure rest is selected as input, then the correct initialDuration will be the
     // duration of the measure's time signature, else is just the input state's duration
     TDuration initialDuration
-        = (cr->durationType() == DurationType::V_MEASURE) ? TDuration(cr->measure()->timesig()) : _is.duration();
+        = (cr->durationType() == DurationType::V_MEASURE) ? TDuration(cr->measure()->timesig(), true) : _is.duration();
     TDuration d = initialDuration.shiftRetainDots(nSteps, stepDotted);
     if (!d.isValid()) {
         return;