QmlDesigner.PropertyEditor: fix image filter

Change-Id: Ia08ce1e955ff82f62d9bb37baa27933592c78448
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"
+                            filter: "*.png *.gif *.jpg *.bmp *.jpeg"
                             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"
+                            filter: "*.png *.gif *.jpg *.bmp *.jpeg"
                             showComboBox: true
                         }
                     }