QmlDesigner.PropertyEditor: also support .svg for Image

Change-Id: If43e4661881f99d6a6f692981f19a61ac2c0e500
Reviewed-by: Alessandro Portale <alessandro.portale@digia.com>

share/qtcreator/qmldesigner/propertyeditor/QtQuick/BorderImageSpecifics.qml

@@ -61,7 +61,7 @@ QWidget {
                                 backendValues.source.value = fileName;
                             }
                             itemNode: anchorBackend.itemNode
-                            filter: "*.png *.gif *.jpg *.bmp *.jpeg"
+                            filter: "*.png *.gif *.jpg *.bmp *.jpeg *.svg"
                             showComboBox: true
                         }
                     }

share/qtcreator/qmldesigner/propertyeditor/QtQuick/ImageSpecifics.qml

@@ -59,7 +59,7 @@ QWidget {
                                 backendValues.source.value = fileName;
                             }
                             itemNode: anchorBackend.itemNode
-                            filter: "*.png *.gif *.jpg *.bmp *.jpeg"
+                            filter: "*.png *.gif *.jpg *.bmp *.jpeg *.svg"
                             showComboBox: true
                         }
                     }