GUI: Fix vuMeter layout when preview disabled

Author: mpiatka

gui/QT/ui/ultragrid_window.ui

@@ -38,7 +38,7 @@
             <item>
              <widget class="VuMeterWidget" name="vuMeterSend" native="true">
               <property name="sizePolicy">
-               <sizepolicy hsizetype="Fixed" vsizetype="Preferred">
+               <sizepolicy hsizetype="Fixed" vsizetype="Expanding">
                 <horstretch>0</horstretch>
                 <verstretch>0</verstretch>
                </sizepolicy>
@@ -136,7 +136,7 @@
             <item>
              <widget class="VuMeterWidget" name="vuMeter" native="true">
               <property name="sizePolicy">
-               <sizepolicy hsizetype="Fixed" vsizetype="Preferred">
+               <sizepolicy hsizetype="Fixed" vsizetype="Expanding">
                 <horstretch>0</horstretch>
                 <verstretch>0</verstretch>
                </sizepolicy>