Use smaller font size as regular size is too large for the control

src/PlanView/SimpleItemEditor.qml

@@ -92,6 +92,7 @@ Rectangle {
                     indexModel:         false
                     model:              object.enumStrings
                     fact:               object
+                    pointSize:          ScreenTools.smallFontPointSize
                     Layout.column:      1
                     Layout.row:         index
                     Layout.fillWidth:   true