QmlDesigner.PropertyEditor: Change step size for reals

the default step size of 1 does not make much sense for reals.

Task-number: QTCREATORBUG-12985
Change-Id: I28be2ca8de37f1032e8fbbe785913ae5a8f6be33
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>

share/qtcreator/qmldesigner/propertyEditorQmlSources/PropertyTemplates/RealEditorTemplate.template

@@ -6,6 +6,7 @@ SpinBox {
     maximumValue: 9999999
     minimumValue: -9999999
     decimals: 2
+    stepSize: 0.1
     backendValue: backendValues.%2
     Layout.fillWidth: true
     Layout.maximumWidth: 100