Fix decimals on heated bed temperature monitor (HeatedBedBox.qml)

Round heated bed temperature values when printer sends them with decimal digits. 
Same roundings already exist on the extruder temperatures (see ExtruderBox.qml line 50 and 85)

resources/qml/PrinterOutput/HeatedBedBox.qml

@@ -32,7 +32,7 @@ Item
         UM.Label
         {
             id: bedTargetTemperature
-            text: printerModel != null ? printerModel.targetBedTemperature + "°C" : ""
+            text: printerModel != null ? Math.round(printerModel.targetBedTemperature) + "°C" : ""
             font: UM.Theme.getFont("default_bold")
             color: UM.Theme.getColor("text_inactive")
             anchors.right: parent.right
@@ -66,7 +66,7 @@ Item
         UM.Label
         {
             id: bedCurrentTemperature
-            text: printerModel != null ? printerModel.bedTemperature + "°C" : ""
+            text: printerModel != null ? Math.round(printerModel.bedTemperature) + "°C" : ""
             font: UM.Theme.getFont("large_bold")
             anchors.right: bedTargetTemperature.left
             anchors.top: parent.top
@@ -293,4 +293,4 @@ Item
             }
         }
     }
-}
+}