Fix missing headerview gap when not showing frame in TableView

Tested on all three platforms and looks better.

Change-Id: I8a68dfc7fe97a05c4313ac10de2f93dabec5a964
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>

src/controls/TableView.qml

@@ -607,7 +607,7 @@ ScrollView {
             anchors.topMargin: viewport.anchors.topMargin
             anchors.leftMargin: viewport.anchors.leftMargin
             anchors.margins: viewport.anchors.margins
-            anchors.rightMargin: __scroller.rightMargin +
+            anchors.rightMargin: (frameVisible ? __scroller.rightMargin : 0) +
                                  (__scroller.outerFrame && __scrollBarTopMargin ? 0 : __verticalScrollBar.width
                                                           + __scroller.scrollBarSpacing + root.__style.padding.right)