QmlDesigner.PropertyEditor: Fix text alignment buttons

They have to use the new enum api.

Change-Id: Ib4ac7d56512007cb19fd7e6a65413198a9d90719
Reviewed-by: Alessandro Portale <alessandro.portale@digia.com>

share/qtcreator/qmldesigner/propertyEditorQmlSources/HelperWidgets/AligmentHorizontalButtons.qml

@@ -110,21 +110,21 @@ Row {
             iconSource: blueHighlight ? "images/alignmentleft-h-icon.png" : "images/alignmentleft-icon.png"
             onClicked: {
                 if (checked)
-                     backendValue.value = "AlignLeft"
+                    backendValue.setEnumeration("Text", "AlignLeft")
             }
         }
         ButtonRowButton {
             iconSource:  blueHighlight ? "images/alignmentcenterh-h-icon.png" : "images/alignmentcenterh-icon.png"
             onClicked: {
                 if (checked)
-                     backendValue.value = "AlignHCenter"
+                    backendValue.setEnumeration("Text", "AlignHCenter")
             }
         }
         ButtonRowButton {
             iconSource: blueHighlight ? "images/alignmentright-h-icon.png" : "images/alignmentright-icon.png"
             onClicked: {
                 if (checked)
-                     backendValue.value = "AlignRight"
+                    backendValue.setEnumeration("Text", "AlignRight")
             }
         }
     }

share/qtcreator/qmldesigner/propertyEditorQmlSources/HelperWidgets/AligmentVerticalButtons.qml

@@ -111,21 +111,21 @@ Row {
             iconSource: blueHighlight ? "images/alignmenttop-h-icon.png" : "images/alignmenttop-icon.png"
             onClicked: {
                 if (checked)
-                     backendValue.value = "AlignTop"
+                    backendValue.setEnumeration("Text", "AlignTop")
             }
         }
         ButtonRowButton {
             iconSource:  blueHighlight ? "images/alignmentmiddle-h-icon.png" : "images/alignmentmiddle-icon.png"
             onClicked: {
                 if (checked)
-                     backendValue.value = "AlignVCenter"
+                    backendValue.setEnumeration("Text", "AlignVCenter")
             }
         }
         ButtonRowButton {
             iconSource: blueHighlight ? "images/alignmentbottom-h-icon.png" : "images/alignmentbottom-icon.png"
             onClicked: {
                 if (checked)
-                     backendValue.value = "AlignBottom"
+                    backendValue.setEnumeration("Text", "AlignBottom")
             }
         }
     }